The phpredis extension provides an API for communicating with the Redis key-value store. It is released under the PHP License, version 3.01. This code has been developed and maintained by Owlient from November 2009 to March 2011.
You can send comments, patches, questions here on github, to [email protected] (@yowgi), to [email protected] (@grumi78) or to [email protected] (@yatsukhnenko).
PhpRedis will always be free and open source software, but if you or your company has found it useful please consider supporting the project. Developing a large, complex, and performant library like PhpRedis takes a great deal of time and effort, and support would be appreciated! ❤️
The best way to support the project is through GitHub sponsors. Many of the reward tiers grant access to our slack channel where myself and Pavlo are regularly available to answer questions. Additionally this will allow you to provide feedback on which fixes and new features to prioritize.
You can also make a one-time contribution with one of the links below.
For everything you should need to install PhpRedis on your system, see the INSTALL.markdown page.
phpredis can be used to store PHP sessions. To do this, configure session.save_handler and session.save_path in your php.ini to tell phpredis where to store the sessions:
session.save_handler = redis
session.save_path = "tcp://host1:6379?weight=1, tcp://host2:6379?weight=2&timeout=2.5, tcp://host3:6379?weight=2&read_timeout=2.5"
session.save_path can have a simple host:port format too, but you need to provide the tcp:// scheme if you want to use the parameters. The following parameters are available:
- weight (integer): the weight of a host is used in comparison with the others in order to customize the session distribution on several hosts. If host A has twice the weight of host B, it will get twice the amount of sessions. In the example, host1 stores 20% of all the sessions (1/(1+2+2)) while host2 and host3 each store 40% (2/(1+2+2)). The target host is determined once and for all at the start of the session, and doesn't change. The default weight is 1.
- timeout (float): the connection timeout to a redis host, expressed in seconds. If the host is unreachable in that amount of time, the session storage will be unavailable for the client. The default timeout is very high (86400 seconds).
- persistent (integer, should be 1 or 0): defines if a persistent connection should be used. (experimental setting)
- prefix (string, defaults to "PHPREDIS_SESSION:"): used as a prefix to the Redis key in which the session is stored. The key is composed of the prefix followed by the session ID.
- auth (string, empty by default): used to authenticate with the server prior to sending commands.
- database (integer): selects a different database.
Sessions have a lifetime expressed in seconds and stored in the INI variable "session.gc_maxlifetime". You can change it with ini_set().
The session handler requires a version of Redis supporting EX and NX options of SET command (at least 2.6.12).
phpredis can also connect to a unix domain socket: session.save_path = "unix:///var/run/redis/redis.sock?persistent=1&weight=1&database=0.
Support: Locking feature is currently only supported for Redis setup with single master instance (e.g. classic master/slave Sentinel environment). So locking may not work properly in RedisArray or RedisCluster environments.
Following INI variables can be used to configure session locking:
; Should the locking be enabled? Defaults to: 0.
redis.session.locking_enabled = 1
; How long should the lock live (in seconds)? Defaults to: value of max_execution_time.
redis.session.lock_expire = 60
; How long to wait between attempts to acquire lock, in microseconds (µs)?. Defaults to: 2000
redis.session.lock_wait_time = 50000
; Maximum number of times to retry (-1 means infinite). Defaults to: 10
redis.session.lock_retries = 10
See dedicated page.
See dedicated page.
See dedicated page.
phpredis uses a small custom unit test suite for testing functionality of the various classes. To run tests, simply do the following:
# Run tests for Redis class (note this is the default)
php tests/TestRedis.php --class Redis
# Run tests for RedisArray class
tests/mkring.sh start
php tests/TestRedis.php --class RedisArray
tests/mkring.sh stop
# Run tests for the RedisCluster class
tests/make-cluster.sh start
php tests/TestRedis.php --class RedisCluster
tests/make-cluster.sh stop
# Run tests for RedisSentinel class
php tests/TestRedis.php --class RedisSentinel
Note that it is possible to run only tests which match a substring of the test itself by passing the additional argument '--test ' when invoking.
# Just run the 'echo' test
php tests/TestRedis.php --class Redis --test echo
Description: Creates a Redis client
$redis = new Redis();phpredis throws a RedisException object if it can't reach the Redis server. That can happen in case of connectivity issues,
if the Redis service is down, or if the redis host is overloaded. In any other problematic case that does not involve an
unreachable server (such as a key not existing, an invalid command, etc), phpredis will return FALSE.
Description: Available Redis Constants
Redis data types, as returned by type
Redis::REDIS_STRING - String
Redis::REDIS_SET - Set
Redis::REDIS_LIST - List
Redis::REDIS_ZSET - Sorted set
Redis::REDIS_HASH - Hash
Redis::REDIS_NOT_FOUND - Not found / other
@TODO: OPT_SERIALIZER, AFTER, BEFORE,...
- connect, open - Connect to a server
- pconnect, popen - Connect to a server (persistent)
- auth - Authenticate to the server
- select - Change the selected database for the current connection
- swapdb - Swaps two Redis databases
- close - Close the connection
- setOption - Set client option
- getOption - Get client option
- ping - Ping the server
- echo - Echo the given string
Description: Connects to a Redis instance.
host: string. can be a host, or the path to a unix domain socket. Starting from version 5.0.0 it is possible to specify schema
port: int, optional
timeout: float, value in seconds (optional, default is 0 meaning unlimited)
reserved: should be NULL if retry_interval is specified
retry_interval: int, value in milliseconds (optional)
read_timeout: float, value in seconds (optional, default is 0 meaning unlimited)
BOOL: TRUE on success, FALSE on error.
$redis->connect('127.0.0.1', 6379);
$redis->connect('127.0.0.1'); // port 6379 by default
$redis->connect('tls://127.0.0.1', 6379); // enable transport level security.
$redis->connect('tls://127.0.0.1'); // enable transport level security, port 6379 by default.
$redis->connect('127.0.0.1', 6379, 2.5); // 2.5 sec timeout.
$redis->connect('/tmp/redis.sock'); // unix domain socket.
$redis->connect('127.0.0.1', 6379, 1, NULL, 100); // 1 sec timeout, 100ms delay between reconnection attempts.Note: open is an alias for connect and will be removed in future versions of phpredis.
Description: Connects to a Redis instance or reuse a connection already established with pconnect/popen.
The connection will not be closed on end of request until the php process ends. So be prepared for too many open FD's errors (specially on redis server side) when using persistent connections on many servers connecting to one redis server.
Also more than one persistent connection can be made identified by either host + port + timeout or host + persistent_id or unix socket + timeout.
Starting from version 4.2.1, it became possible to use connection pooling by setting INI variable redis.pconnect.pooling_enabled to 1.
This feature is not available in threaded versions. pconnect and popen then working like their non
persistent equivalents.
host: string. can be a host, or the path to a unix domain socket. Starting from version 5.0.0 it is possible to specify schema
port: int, optional
timeout: float, value in seconds (optional, default is 0 meaning unlimited)
persistent_id: string. identity for the requested persistent connection
retry_interval: int, value in milliseconds (optional)
read_timeout: float, value in seconds (optional, default is 0 meaning unlimited)
BOOL: TRUE on success, FALSE on error.
$redis->pconnect('127.0.0.1', 6379);
$redis->pconnect('127.0.0.1'); // port 6379 by default - same connection like before.
$redis->pconnect('tls://127.0.0.1', 6379); // enable transport level security.
$redis->pconnect('tls://127.0.0.1'); // enable transport level security, port 6379 by default.
$redis->pconnect('127.0.0.1', 6379, 2.5); // 2.5 sec timeout and would be another connection than the two before.
$redis->pconnect('127.0.0.1', 6379, 2.5, 'x'); // x is sent as persistent_id and would be another connection than the three before.
$redis->pconnect('/tmp/redis.sock'); // unix domain socket - would be another connection than the four before.Note: popen is an alias for pconnect and will be removed in future versions of phpredis.
Description: Authenticate the connection using a password. Warning: The password is sent in plain-text over the network.
STRING: password
BOOL: TRUE if the connection is authenticated, FALSE otherwise.
$redis->auth('foobared');Description: Change the selected database for the current connection.
INTEGER: dbindex, the database number to switch to.
TRUE in case of success, FALSE in case of failure.
See method for example: move
Description: Swap one Redis database with another atomically
INTEGER: db1
INTEGER: db2
TRUE on success and FALSE on failure.
Note: Requires Redis >= 4.0.0
$redis->swapdb(0, 1); /* Swaps DB 0 with DB 1 atomically */Description: Disconnects from the Redis instance.
Note: Closing a persistent connection requires PhpRedis >= 4.2.0.
None.
BOOL: TRUE on success, FALSE on failure.
Description: Set client option.
parameter name
parameter value
BOOL: TRUE on success, FALSE on error.
$redis->setOption(Redis::OPT_SERIALIZER, Redis::SERIALIZER_NONE); // Don't serialize data
$redis->setOption(Redis::OPT_SERIALIZER, Redis::SERIALIZER_PHP); // Use built-in serialize/unserialize
$redis->setOption(Redis::OPT_SERIALIZER, Redis::SERIALIZER_IGBINARY); // Use igBinary serialize/unserialize
$redis->setOption(Redis::OPT_SERIALIZER, Redis::SERIALIZER_MSGPACK); // Use msgpack serialize/unserialize
$redis->setOption(Redis::OPT_PREFIX, 'myAppName:'); // use custom prefix on all keys
/* Options for the SCAN family of commands, indicating whether to abstract
empty results from the user. If set to SCAN_NORETRY (the default), phpredis
will just issue one SCAN command at a time, sometimes returning an empty
array of results. If set to SCAN_RETRY, phpredis will retry the scan command
until keys come back OR Redis returns an iterator of zero
*/
$redis->setOption(Redis::OPT_SCAN, Redis::SCAN_NORETRY);
$redis->setOption(Redis::OPT_SCAN, Redis::SCAN_RETRY);
/* Scan can also be configured to automatically prepend the currently set PhpRedis
prefix to any MATCH pattern. */
$redis->setOption(Redis::OPT_SCAN, Redis::SCAN_PREFIX);
$redis->setOption(Redis::OPT_SCAN, Redis::SCAN_NOPREFIX);Description: Get client option.
parameter name
Parameter value.
// return Redis::SERIALIZER_NONE, Redis::SERIALIZER_PHP,
// Redis::SERIALIZER_IGBINARY, or Redis::SERIALIZER_MSGPACK
$redis->getOption(Redis::OPT_SERIALIZER);Description: Check the current connection status.
$redis->ping([string $message]);Mixed: This method returns TRUE on success, or the passed string if called with an argument.
/* When called without an argument, PING returns `TRUE` */
$redis->ping();
/* If passed an argument, that argument is returned. Here 'hello' will be returned */
$redis->ping('hello');Note: Prior to PhpRedis 5.0.0 this command simply returned the string +PONG.
Description: Sends a string to Redis, which replies with the same string
STRING: The message to send.
STRING: the same message.
- bgRewriteAOF - Asynchronously rewrite the append-only file
- bgSave - Asynchronously save the dataset to disk (in background)
- config - Get or Set the Redis server configuration parameters
- dbSize - Return the number of keys in selected database
- flushAll - Remove all keys from all databases
- flushDb - Remove all keys from the current database
- info - Get information and statistics about the server
- lastSave - Get the timestamp of the last disk save
- resetStat - Reset the stats returned by info method.
- save - Synchronously save the dataset to disk (wait to complete)
- slaveOf - Make the server a slave of another instance, or promote it to master
- time - Return the current server time
- slowLog - Access the Redis slowLog entries
Description: Start the background rewrite of AOF (Append-Only File)
None.
BOOL: TRUE in case of success, FALSE in case of failure.
$redis->bgRewriteAOF();Description: Asynchronously save the dataset to disk (in background)
None.
BOOL: TRUE in case of success, FALSE in case of failure. If a save is already running, this command will fail and return FALSE.
$redis->bgSave();Description: Get or Set the Redis server configuration parameters.
operation (string) either GET or SET
key string for SET, glob-pattern for GET. See http://redis.io/commands/config-get for examples.
value optional string (only for SET)
Associative array for GET, key -> value
bool for SET
$redis->config("GET", "*max-*-entries*");
$redis->config("SET", "dir", "/var/run/redis/dumps/");Description: Return the number of keys in selected database.
None.
INTEGER: DB size, in number of keys.
$count = $redis->dbSize();
echo "Redis has $count keys\n";Description: Remove all keys from all databases.
async (bool) requires server version 4.0.0 or greater
BOOL: Always TRUE.
$redis->flushAll();Description: Remove all keys from the current database.
async (bool) requires server version 4.0.0 or greater
BOOL: Always TRUE.
$redis->flushDb();Description: Get information and statistics about the server
Returns an associative array that provides information about the server. Passing no arguments to INFO will call the standard REDIS INFO command, which returns information such as the following:
- redis_version
- arch_bits
- uptime_in_seconds
- uptime_in_days
- connected_clients
- connected_slaves
- used_memory
- changes_since_last_save
- bgsave_in_progress
- last_save_time
- total_connections_received
- total_commands_processed
- role
You can pass a variety of options to INFO (per the Redis documentation), which will modify what is returned.
option: The option to provide redis (e.g. "COMMANDSTATS", "CPU")
$redis->info(); /* standard redis INFO command */
$redis->info("COMMANDSTATS"); /* Information on the commands that have been run (>=2.6 only)
$redis->info("CPU"); /* just CPU information from Redis INFO */Description: Returns the timestamp of the last disk save.
None.
INT: timestamp.
$redis->lastSave();Description: Reset the stats returned by info method.
These are the counters that are reset:
- Keyspace hits
- Keyspace misses
- Number of commands processed
- Number of connections received
- Number of expired keys
None.
BOOL: TRUE in case of success, FALSE in case of failure.
$redis->resetStat();Description: Synchronously save the dataset to disk (wait to complete)
None.
BOOL: TRUE in case of success, FALSE in case of failure. If a save is already running, this command will fail and return FALSE.
$redis->save();Description: Changes the slave status
Either host (string) and port (int), or no parameter to stop being a slave.
BOOL: TRUE in case of success, FALSE in case of failure.
$redis->slaveOf('10.0.1.7', 6379);
/* ... */
$redis->slaveOf();Description: Return the current server time.
(none)
If successful, the time will come back as an associative array with element zero being the unix timestamp, and element one being microseconds.
$redis->time();Description: Access the Redis slowLog
Operation (string): This can be either GET, LEN, or RESET
Length (integer), optional: If executing a SLOWLOG GET command, you can pass an optional length.
The return value of SLOWLOG will depend on which operation was performed. SLOWLOG GET: Array of slowLog entries, as provided by Redis SLOGLOG LEN: Integer, the length of the slowLog SLOWLOG RESET: Boolean, depending on success
// Get ten slowLog entries
$redis->slowLog('get', 10);
// Get the default number of slowLog entries
$redis->slowLog('get');
// Reset our slowLog
$redis->slowLog('reset');
// Retrieve slowLog length
$redis->slowLog('len');- append - Append a value to a key
- bitCount - Count set bits in a string
- bitOp - Perform bitwise operations between strings
- decr, decrBy - Decrement the value of a key
- get - Get the value of a key
- getBit - Returns the bit value at offset in the string value stored at key
- getRange - Get a substring of the string stored at a key
- getSet - Set the string value of a key and return its old value
- incr, incrBy - Increment the value of a key
- incrByFloat - Increment the float value of a key by the given amount
- mGet, getMultiple - Get the values of all the given keys
- mSet, mSetNX - Set multiple keys to multiple values
- set - Set the string value of a key
- setBit - Sets or clears the bit at offset in the string value stored at key
- setEx, pSetEx - Set the value and expiration of a key
- setNx - Set the value of a key, only if the key does not exist
- setRange - Overwrite part of a string at key starting at the specified offset
- strLen - Get the length of the value stored in a key
- del, delete, unlink - Delete a key
- dump - Return a serialized version of the value stored at the specified key.
- exists - Determine if a key exists
- expire, setTimeout, pexpire - Set a key's time to live in seconds
- expireAt, pexpireAt - Set the expiration for a key as a UNIX timestamp
- keys, getKeys - Find all keys matching the given pattern
- scan - Scan for keys in the keyspace (Redis >= 2.8.0)
- migrate - Atomically transfer a key from a Redis instance to another one
- move - Move a key to another database
- object - Inspect the internals of Redis objects
- persist - Remove the expiration from a key
- randomKey - Return a random key from the keyspace
- rename, renameKey - Rename a key
- renameNx - Rename a key, only if the new key does not exist
- type - Determine the type stored at key
- sort - Sort the elements in a list, set or sorted set
- ttl, pttl - Get the time to live for a key
- restore - Create a key using the provided serialized value, previously obtained with dump.
Description: Get the value related to the specified key
key
String or Bool: If key didn't exist, FALSE is returned. Otherwise, the value related to this key is returned.
$redis->get('key');Description: Set the string value in argument as value of the key. If you're using Redis >= 2.6.12, you can pass extended options as explained below
Key
Value
Timeout or Options Array (optional). If you pass an integer, phpredis will redirect to SETEX, and will try to use Redis >= 2.6.12 extended options if you pass an array with valid values
Bool TRUE if the command is successful.
// Simple key -> value set
$redis->set('key', 'value');
// Will redirect, and actually make an SETEX call
$redis->set('key','value', 10);
// Will set the key, if it doesn't exist, with a ttl of 10 seconds
$redis->set('key', 'value', ['nx', 'ex'=>10]);
// Will set a key, if it does exist, with a ttl of 1000 milliseconds
$redis->set('key', 'value', ['xx', 'px'=>1000]);Description: Set the string value in argument as value of the key, with a time to live. PSETEX uses a TTL in milliseconds.
Key TTL Value
Bool TRUE if the command is successful.
$redis->setEx('key', 3600, 'value'); // sets key → value, with 1h TTL.
$redis->pSetEx('key', 100, 'value'); // sets key → value, with 0.1 sec TTL.Description: Set the string value in argument as value of the key if the key doesn't already exist in the database.
key value
Bool TRUE in case of success, FALSE in case of failure.
$redis->setNx('key', 'value'); /* return TRUE */
$redis->setNx('key', 'value'); /* return FALSE */Description: Remove specified keys.
An array of keys, or an undefined number of parameters, each a key: key1 key2 key3 ... keyN
Note: If you are connecting to Redis server >= 4.0.0 you can remove a key with the unlink method in the exact same way you would use del. The Redis unlink command is non-blocking and will perform the actual deletion asynchronously.
Long Number of keys deleted.
$redis->set('key1', 'val1');
$redis->set('key2', 'val2');
$redis->set('key3', 'val3');
$redis->set('key4', 'val4');
$redis->del('key1', 'key2'); /* return 2 */
$redis->del(['key3', 'key4']); /* return 2 */
/* If using Redis >= 4.0.0 you can call unlink */
$redis->unlink('key1', 'key2');
$redis->unlink(['key1', 'key2']);Note: delete is an alias for del and will be removed in future versions of phpredis.
Description: Verify if the specified key exists.
key
long: The number of keys tested that do exist.
$redis->set('key', 'value');
$redis->exists('key'); /* 1 */
$redis->exists('NonExistingKey'); /* 0 */
$redis->mset(['foo' => 'foo', 'bar' => 'bar', 'baz' => 'baz']);
$redis->exists(['foo', 'bar', 'baz]); /* 3 */
$redis->exists('foo', 'bar', 'baz'); /* 3 */Note: This function took a single argument and returned TRUE or FALSE in phpredis versions < 4.0.0.
Description: Increment the number stored at key by one. If the second argument is filled, it will be used as the integer value of the increment.
key
value: value that will be added to key (only for incrBy)
INT the new value
$redis->incr('key1'); /* key1 didn't exists, set to 0 before the increment */
/* and now has the value 1 */
$redis->incr('key1'); /* 2 */
$redis->incr('key1'); /* 3 */
$redis->incr('key1'); /* 4 */
// Will redirect, and actually make an INCRBY call
$redis->incr('key1', 10); /* 14 */
$redis->incrBy('key1', 10); /* 24 */Description: Increment the key with floating point precision.
key
value: (float) value that will be added to the key
FLOAT the new value
$redis->incrByFloat('key1', 1.5); /* key1 didn't exist, so it will now be 1.5 */
$redis->incrByFloat('key1', 1.5); /* 3 */
$redis->incrByFloat('key1', -1.5); /* 1.5 */
$redis->incrByFloat('key1', 2.5); /* 4 */Description: Decrement the number stored at key by one. If the second argument is filled, it will be used as the integer value of the decrement.
key
value: value that will be subtracted to key (only for decrBy)
INT the new value
$redis->decr('key1'); /* key1 didn't exists, set to 0 before the increment */
/* and now has the value -1 */
$redis->decr('key1'); /* -2 */
$redis->decr('key1'); /* -3 */
// Will redirect, and actually make an DECRBY call
$redis->decr('key1', 10); /* -13 */
$redis->decrBy('key1', 10); /* -23 */Description: Get the values of all the specified keys. If one or more keys don't exist, the array will contain FALSE at the position of the key.
Array: Array containing the list of the keys
Array: Array containing the values related to keys in argument
$redis->set('key1', 'value1');
$redis->set('key2', 'value2');
$redis->set('key3', 'value3');
$redis->mGet(['key1', 'key2', 'key3']); /* ['value1', 'value2', 'value3'];
$redis->mGet(['key0', 'key1', 'key5']); /* [`FALSE`, 'value1', `FALSE`];Note: getMultiple is an alias for mGet and will be removed in future versions of phpredis.
Description: Sets a value and returns the previous entry at that key.
Key: key
STRING: value
A string, the previous value located at this key.
$redis->set('x', '42');
$exValue = $redis->getSet('x', 'lol'); // return '42', replaces x by 'lol'
$newValue = $redis->get('x')' // return 'lol'Description: Returns a random key.
None.
STRING: an existing key in redis.
$key = $redis->randomKey();
$surprise = $redis->get($key); // who knows what's in there.Description: Moves a key to a different database.
Key: key, the key to move.
INTEGER: dbindex, the database number to move the key to.
BOOL: TRUE in case of success, FALSE in case of failure.
$redis->select(0); // switch to DB 0
$redis->set('x', '42'); // write 42 to x
$redis->move('x', 1); // move to DB 1
$redis->select(1); // switch to DB 1
$redis->get('x'); // will return 42Description: Renames a key.
STRING: srckey, the key to rename.
STRING: dstkey, the new name for the key.
BOOL: TRUE in case of success, FALSE in case of failure.
$redis->set('x', '42');
$redis->rename('x', 'y');
$redis->get('y'); // → 42
$redis->get('x'); // → `FALSE`Note: renameKey is an alias for rename and will be removed in future versions of phpredis.
Description: Same as rename, but will not replace a key if the destination already exists. This is the same behaviour as setNx.
Description: Sets an expiration date (a timeout) on an item. pexpire requires a TTL in milliseconds.
Key: key. The key that will disappear.
Integer: ttl. The key's remaining Time To Live, in seconds.
BOOL: TRUE in case of success, FALSE in case of failure.
$redis->set('x', '42');
$redis->expire('x', 3); // x will disappear in 3 seconds.
sleep(5); // wait 5 seconds
$redis->get('x'); // will return `FALSE`, as 'x' has expired.Note: setTimeout is an alias for expire and will be removed in future versions of phpredis.
Description: Sets an expiration date (a timestamp) on an item. pexpireAt requires a timestamp in milliseconds.
Key: key. The key that will disappear.
Integer: Unix timestamp. The key's date of death, in seconds from Epoch time.
BOOL: TRUE in case of success, FALSE in case of failure.
$redis->set('x', '42');
$now = time(NULL); // current timestamp
$redis->expireAt('x', $now + 3); // x will disappear in 3 seconds.
sleep(5); // wait 5 seconds
$redis->get('x'); // will return `FALSE`, as 'x' has expired.Description: Returns the keys that match a certain pattern.
STRING: pattern, using '*' as a wildcard.
Array of STRING: The keys that match a certain pattern.
$allKeys = $redis->keys('*'); // all keys will match this.
$keyWithUserPrefix = $redis->keys('user*');Note: getKeys is an alias for keys and will be removed in future versions of phpredis.
Description: Scan the keyspace for keys
LONG (reference): Iterator, initialized to NULL STRING, Optional: Pattern to match LONG, Optional: Count of keys per iteration (only a suggestion to Redis)
Array, boolean: This function will return an array of keys or FALSE if Redis returned zero keys
Note: SCAN is a "directed node" command in RedisCluster
/* Without enabling Redis::SCAN_RETRY (default condition) */
$it = NULL;
do {
// Scan for some keys
$arr_keys = $redis->scan($it);
// Redis may return empty results, so protect against that
if ($arr_keys !== FALSE) {
foreach($arr_keys as $str_key) {
echo "Here is a key: $str_key\n";
}
}
} while ($it > 0);
echo "No more keys to scan!\n";
/* With Redis::SCAN_RETRY enabled */
$redis->setOption(Redis::OPT_SCAN, Redis::SCAN_RETRY);
$it = NULL;
/* phpredis will retry the SCAN command if empty results are returned from the
server, so no empty results check is required. */
while ($arr_keys = $redis->scan($it)) {
foreach ($arr_keys as $str_key) {
echo "Here is a key: $str_key\n";
}
}
echo "No more keys to scan!\n";Description: Describes the object pointed to by a key.
The information to retrieve (string) and the key (string). Info can be one of the following:
- "encoding"
- "refcount"
- "idletime"
STRING for "encoding", LONG for "refcount" and "idletime", FALSE if the key doesn't exist.
$redis->object("encoding", "l"); // → ziplist
$redis->object("refcount", "l"); // → 1
$redis->object("idletime", "l"); // → 400 (in seconds, with a precision of 10 seconds).Description: Returns the type of data pointed by a given key.
Key: key
Depending on the type of the data pointed by the key, this method will return the following value:
string: Redis::REDIS_STRING
set: Redis::REDIS_SET
list: Redis::REDIS_LIST
zset: Redis::REDIS_ZSET
hash: Redis::REDIS_HASH
other: Redis::REDIS_NOT_FOUND
$redis->type('key');Description: Append specified string to the string stored in specified key.
Key Value
INTEGER: Size of the value after the append
$redis->set('key', 'value1');
$redis->append('key', 'value2'); /* 12 */
$redis->get('key'); /* 'value1value2' */Description: Return a substring of a larger string
key
start
end
STRING: the substring
$redis->set('key', 'string value');
$redis->getRange('key', 0, 5); /* 'string' */
$redis->getRange('key', -5, -1); /* 'value' */Note: substr is an alias for getRange and will be removed in future versions of phpredis.
Description: Changes a substring of a larger string.
key offset value
STRING: the length of the string after it was modified.
$redis->set('key', 'Hello world');
$redis->setRange('key', 6, "redis"); /* returns 11 */
$redis->get('key'); /* "Hello redis" */Description: Get the length of a string value.
key
INTEGER
$redis->set('key', 'value');
$redis->strlen('key'); /* 5 */Description: Return a single bit out of a larger string
key
offset
LONG: the bit value (0 or 1)
$redis->set('key', "\x7f"); // this is 0111 1111
$redis->getBit('key', 0); /* 0 */
$redis->getBit('key', 1); /* 1 */Description: Changes a single bit of a string.
key
offset
value: bool or int (1 or 0)
LONG: 0 or 1, the value of the bit before it was set.
$redis->set('key', "*"); // ord("*") = 42 = 0x2f = "0010 1010"
$redis->setBit('key', 5, 1); /* returns 0 */
$redis->setBit('key', 7, 1); /* returns 0 */
$redis->get('key'); /* chr(0x2f) = "/" = b("0010 1111") */Description: Bitwise operation on multiple keys.
operation: either "AND", "OR", "NOT", "XOR"
ret_key: return key
key1
key2...
LONG: The size of the string stored in the destination key.
Description: Count bits in a string.
key
LONG: The number of bits set to 1 in the value behind the input key.
Description: Sort the elements in a list, set or sorted set.
Key: key Options: [key => value, ...] - optional, with the following keys and values:
'by' => 'some_pattern_*',
'limit' => [0, 1],
'get' => 'some_other_pattern_*' or an array of patterns,
'sort' => 'asc' or 'desc',
'alpha' => TRUE,
'store' => 'external-key'
An array of values, or a number corresponding to the number of elements stored if that was used.
$redis->del('s');
$redis->sAdd('s', 5);
$redis->sAdd('s', 4);
$redis->sAdd('s', 2);
$redis->sAdd('s', 1);
$redis->sAdd('s', 3);
var_dump($redis->sort('s')); // 1,2,3,4,5
var_dump($redis->sort('s', ['sort' => 'desc'])); // 5,4,3,2,1
var_dump($redis->sort('s', ['sort' => 'desc', 'store' => 'out'])); // (int)5Description: Returns the time to live left for a given key in seconds (ttl), or milliseconds (pttl).
Key: key
LONG: The time to live in seconds. If the key has no ttl, -1 will be returned, and -2 if the key doesn't exist.
$redis->ttl('key');Description: Remove the expiration timer from a key.
Key: key
BOOL: TRUE if a timeout was removed, FALSE if the key didn’t exist or didn’t have an expiration timer.
$redis->persist('key');Description: Sets multiple key-value pairs in one atomic command. MSETNX only returns TRUE if all the keys were set (see SETNX).
Pairs: [key => value, ...]
Bool TRUE in case of success, FALSE in case of failure.
$redis->mSet(['key0' => 'value0', 'key1' => 'value1']);
var_dump($redis->get('key0'));
var_dump($redis->get('key1'));Output:
string(6) "value0"
string(6) "value1"
Description: Dump a key out of a redis database, the value of which can later be passed into redis using the RESTORE command. The data that comes out of DUMP is a binary representation of the key as Redis stores it.
key string
The Redis encoded value of the key, or FALSE if the key doesn't exist
$redis->set('foo', 'bar');
$val = $redis->dump('foo'); // $val will be the Redis encoded key valueDescription: Restore a key from the result of a DUMP operation.
key string. The key name
ttl integer. How long the key should live (if zero, no expire will be set on the key)
value string (binary). The Redis encoded key value (from DUMP)
$redis->set('foo', 'bar');
$val = $redis->dump('foo');
$redis->restore('bar', 0, $val); // The key 'bar', will now be equal to the key 'foo'Description: Migrates a key to a different Redis instance.
Note:: Redis introduced migrating multiple keys in 3.0.6, so you must have at least
that version in order to call migrate with an array of keys.
host string. The destination host
port integer. The TCP port to connect to.
key(s) string or array.
destination-db integer. The target DB.
timeout integer. The maximum amount of time given to this transfer.
copy boolean, optional. Should we send the COPY flag to redis.
replace boolean, optional. Should we send the REPLACE flag to redis
$redis->migrate('backup', 6379, 'foo', 0, 3600);
$redis->migrate('backup', 6379, 'foo', 0, 3600, true, true); /* copy and replace */
$redis->migrate('backup', 6379, 'foo', 0, 3600, false, true); /* just REPLACE flag */
/* Migrate multiple keys (requires Redis >= 3.0.6)
$redis->migrate('backup', 6379, ['key1', 'key2', 'key3'], 0, 3600);- hDel - Delete one or more hash fields
- hExists - Determine if a hash field exists
- hGet - Get the value of a hash field
- hGetAll - Get all the fields and values in a hash
- hIncrBy - Increment the integer value of a hash field by the given number
- hIncrByFloat - Increment the float value of a hash field by the given amount
- hKeys - Get all the fields in a hash
- hLen - Get the number of fields in a hash
- hMGet - Get the values of all the given hash fields
- hMSet - Set multiple hash fields to multiple values
- hSet - Set the string value of a hash field
- hSetNx - Set the value of a hash field, only if the field does not exist
- hVals - Get all the values in a hash
- hScan - Scan a hash key for members
- hStrLen - Get the string length of the value associated with field in the hash
Description: Adds a value to the hash stored at key.
key
hashKey
value
LONG 1 if value didn't exist and was added successfully, 0 if the value was already present and was replaced, FALSE if there was an error.
$redis->del('h')
$redis->hSet('h', 'key1', 'hello'); /* 1, 'key1' => 'hello' in the hash at "h" */
$redis->hGet('h', 'key1'); /* returns "hello" */
$redis->hSet('h', 'key1', 'plop'); /* 0, value was replaced. */
$redis->hGet('h', 'key1'); /* returns "plop" */Description: Adds a value to the hash stored at key only if this field isn't already in the hash.
BOOL TRUE if the field was set, FALSE if it was already present.
$redis->del('h')
$redis->hSetNx('h', 'key1', 'hello'); /* TRUE, 'key1' => 'hello' in the hash at "h" */
$redis->hSetNx('h', 'key1', 'world'); /* FALSE, 'key1' => 'hello' in the hash at "h". No change since the field wasn't replaced. */Description: Gets a value from the hash stored at key. If the hash table doesn't exist, or the key doesn't exist, FALSE is returned.
key
hashKey
STRING The value, if the command executed successfully
BOOL FALSE in case of failure
Description: Returns the length of a hash, in number of items
key
LONG the number of items in a hash, FALSE if the key doesn't exist or isn't a hash.
$redis->del('h')
$redis->hSet('h', 'key1', 'hello');
$redis->hSet('h', 'key2', 'plop');
$redis->hLen('h'); /* returns 2 */Description: Removes a value from the hash stored at key. If the hash table doesn't exist, or the key doesn't exist, FALSE is returned.
key
hashKey1
hashKey2
...
LONG the number of deleted keys, 0 if the key doesn't exist, FALSE if the key isn't a hash.
Description: Returns the keys in a hash, as an array of strings.
Key: key
An array of elements, the keys of the hash. This works like PHP's array_keys().
$redis->del('h');
$redis->hSet('h', 'a', 'x');
$redis->hSet('h', 'b', 'y');
$redis->hSet('h', 'c', 'z');
$redis->hSet('h', 'd', 't');
var_dump($redis->hKeys('h'));Output:
array(4) {
[0]=>
string(1) "a"
[1]=>
string(1) "b"
[2]=>
string(1) "c"
[3]=>
string(1) "d"
}
The order is random and corresponds to redis' own internal representation of the set structure.
Description: Returns the values in a hash, as an array of strings.
Key: key
An array of elements, the values of the hash. This works like PHP's array_values().
$redis->del('h');
$redis->hSet('h', 'a', 'x');
$redis->hSet('h', 'b', 'y');
$redis->hSet('h', 'c', 'z');
$redis->hSet('h', 'd', 't');
var_dump($redis->hVals('h'));Output:
array(4) {
[0]=>
string(1) "x"
[1]=>
string(1) "y"
[2]=>
string(1) "z"
[3]=>
string(1) "t"
}
The order is random and corresponds to redis' own internal representation of the set structure.
Description: Returns the whole hash, as an array of strings indexed by strings.
Key: key
An array of elements, the contents of the hash.
$redis->del('h');
$redis->hSet('h', 'a', 'x');
$redis->hSet('h', 'b', 'y');
$redis->hSet('h', 'c', 'z');
$redis->hSet('h', 'd', 't');
var_dump($redis->hGetAll('h'));Output:
array(4) {
["a"]=>
string(1) "x"
["b"]=>
string(1) "y"
["c"]=>
string(1) "z"
["d"]=>
string(1) "t"
}
The order is random and corresponds to redis' own internal representation of the set structure.
Description: Verify if the specified member exists in a key.
key
memberKey
BOOL: If the member exists in the hash table, return TRUE, otherwise return FALSE.
$redis->hSet('h', 'a', 'x');
$redis->hExists('h', 'a'); /* TRUE */
$redis->hExists('h', 'NonExistingKey'); /* FALSE */Description: Increments the value of a member from a hash by a given amount.
key
member
value: (integer) value that will be added to the member's value
LONG the new value
$redis->del('h');
$redis->hIncrBy('h', 'x', 2); /* returns 2: h[x] = 2 now. */
$redis->hIncrBy('h', 'x', 1); /* h[x] ← 2 + 1. Returns 3 */Description: Increments the value of a hash member by the provided float value
key
member
value: (float) value that will be added to the member's value
FLOAT the new value
$redis->del('h');
$redis->hIncrByFloat('h','x', 1.5); /* returns 1.5: h[x] = 1.5 now */
$redis->hIncrByFloat('h', 'x', 1.5); /* returns 3.0: h[x] = 3.0 now */
$redis->hIncrByFloat('h', 'x', -3.0); /* returns 0.0: h[x] = 0.0 now */Description: Fills in a whole hash. Non-string values are converted to string, using the standard (string) cast. NULL values are stored as empty strings.
key
members: key → value array
BOOL
$redis->del('user:1');
$redis->hMSet('user:1', ['name' => 'Joe', 'salary' => 2000]);
$redis->hIncrBy('user:1', 'salary', 100); // Joe earns 100 more now.Description: Retrieve the values associated to the specified fields in the hash.
key
memberKeys Array
Array An array of elements, the values of the specified fields in the hash, with the hash keys as array keys.
$redis->del('h');
$redis->hSet('h', 'field1', 'value1');
$redis->hSet('h', 'field2', 'value2');
$redis->hMGet('h', ['field1', 'field2']); /* returns ['field1' => 'value1', 'field2' => 'value2'] */Description: Scan a HASH value for members, with an optional pattern and count
key: String
iterator: Long (reference)
pattern: Optional pattern to match against
count: How many keys to return in a go (only a suggestion to Redis)
Array An array of members that match our pattern
$it = NULL;
/* Don't ever return an empty array until we're done iterating */
$redis->setOption(Redis::OPT_SCAN, Redis::SCAN_RETRY);
while($arr_keys = $redis->hScan('hash', $it)) {
foreach($arr_keys as $str_field => $str_value) {
echo "$str_field => $str_value\n"; /* Print the hash member and value */
}
}Description: Get the string length of the value associated with field in the hash stored at key.
key: String
field: String
LONG the string length of the value associated with field, or zero when field is not present in the hash or key does not exist at all.
- blPop, brPop - Remove and get the first/last element in a list
- bRPopLPush - Pop a value from a list, push it to another list and return it
- lIndex, lGet - Get an element from a list by its index
- lInsert - Insert an element before or after another element in a list
- lLen, lSize - Get the length/size of a list
- lPop - Remove and get the first element in a list
- lPush - Prepend one or multiple values to a list
- lPushx - Prepend a value to a list, only if the list exists
- lRange, lGetRange - Get a range of elements from a list
- lRem, lRemove - Remove elements from a list
- lSet - Set the value of an element in a list by its index
- lTrim, listTrim - Trim a list to the specified range
- rPop - Remove and get the last element in a list
- rPopLPush - Remove the last element in a list, append it to another list and return it (redis >= 1.1)
- rPush - Append one or multiple values to a list
- rPushX - Append a value to a list, only if the list exists
Description: Is a blocking lPop(rPop) primitive. If at least one of the lists contains at least one element, the element will be popped from the head of the list and returned to the caller. If all the list identified by the keys passed in arguments are empty, blPop will block during the specified timeout until an element is pushed to one of those lists. This element will be popped.
ARRAY Array containing the keys of the lists
INTEGER Timeout
Or
STRING Key1
STRING Key2
STRING Key3
...
STRING Keyn
INTEGER Timeout
ARRAY ['listName', 'element']
/* Non blocking feature */
$redis->lPush('key1', 'A');
$redis->del('key2');
$redis->blPop('key1', 'key2', 10); /* ['key1', 'A'] */
/* OR */
$redis->blPop(['key1', 'key2'], 10); /* ['key1', 'A'] */
$redis->brPop('key1', 'key2', 10); /* ['key1', 'A'] */
/* OR */
$redis->brPop(['key1', 'key2'], 10); /* ['key1', 'A'] */
/* Blocking feature */
/* process 1 */
$redis->del('key1');
$redis->blPop('key1', 10);
/* blocking for 10 seconds */
/* process 2 */
$redis->lPush('key1', 'A');
/* process 1 */
/* ['key1', 'A'] is returned*/Description: A blocking version of rPopLPush, with an integral timeout in the third parameter.
Key: srckey
Key: dstkey
Long: timeout
STRING The element that was moved in case of success, FALSE in case of timeout.
Description: Return the specified element of the list stored at the specified key.
0 the first element, 1 the second ...
-1 the last element, -2 the penultimate ...
Return FALSE in case of a bad index or a key that doesn't point to a list.
key
index
String the element at this index
Bool FALSE if the key identifies a non-string data type, or no value corresponds to this index in the list Key.
$redis->rPush('key1', 'A');
$redis->rPush('key1', 'B');
$redis->rPush('key1', 'C'); /* key1 => [ 'A', 'B', 'C' ] */
$redis->lindex('key1', 0); /* 'A' */
$redis->lindex('key1', -1); /* 'C' */
$redis->lindex('key1', 10); /* `FALSE` */Note: lGet is an alias for lIndex and will be removed in future versions of phpredis.
Description: Insert value in the list before or after the pivot value.
The parameter options specify the position of the insert (before or after). If the list didn't exists, or the pivot didn't exists, the value is not inserted.
key
position Redis::BEFORE | Redis::AFTER
pivot
value
The number of the elements in the list, -1 if the pivot didn't exists.
$redis->del('key1');
$redis->lInsert('key1', Redis::AFTER, 'A', 'X'); /* 0 */
$redis->lPush('key1', 'A');
$redis->lPush('key1', 'B');
$redis->lPush('key1', 'C');
$redis->lInsert('key1', Redis::BEFORE, 'C', 'X'); /* 4 */
$redis->lRange('key1', 0, -1); /* ['A', 'B', 'X', 'C'] */
$redis->lInsert('key1', Redis::AFTER, 'C', 'Y'); /* 5 */
$redis->lRange('key1', 0, -1); /* ['A', 'B', 'X', 'C', 'Y'] */
$redis->lInsert('key1', Redis::AFTER, 'W', 'value'); /* -1 */Description: Return and remove the first element of the list.
key
STRING if command executed successfully
BOOL FALSE in case of failure (empty list)
$redis->rPush('key1', 'A');
$redis->rPush('key1', 'B');
$redis->rPush('key1', 'C'); /* key1 => [ 'A', 'B', 'C' ] */
$redis->lPop('key1'); /* key1 => [ 'B', 'C' ] */Description: Adds one or more values to the head of a LIST. Creates the list if the key didn't exist. If the key exists and is not a list, FALSE is returned.
$redis->lPush($key, $entry [, $entry, $entry]);LONG The new length of the list in case of success, FALSE in case of Failure.
$redis->del('key1');
$redis->lPush('key1', 'F'); // returns 1
$redis->lPush('key1', 'E'); // returns 2
$redis->lPush('key1', 'D'); // returns 3
/* key1 now contains: [ 'D', 'E', 'F' ] */
$redis->lPush('key1', 'C', 'B', 'A'); // Returns 6
/* key1 now contains: [ 'A', 'B', 'C', 'D', 'E', 'F' ]Description: Adds the string value to the head (left) of the list if the list exists.
key
value String, value to push in key
LONG The new length of the list in case of success, FALSE in case of Failure.
$redis->del('key1');
$redis->lPushx('key1', 'A'); // returns 0
$redis->lPush('key1', 'A'); // returns 1
$redis->lPushx('key1', 'B'); // returns 2
$redis->lPushx('key1', 'C'); // returns 3
/* key1 now points to the following list: [ 'A', 'B', 'C' ] */Description: Returns the specified elements of the list stored at the specified key in the range [start, end]. start and stop are interpreted as indices:
0 the first element, 1 the second ...
-1 the last element, -2 the penultimate ...
key
start
end
Array containing the values in specified range.
$redis->rPush('key1', 'A');
$redis->rPush('key1', 'B');
$redis->rPush('key1', 'C');
$redis->lRange('key1', 0, -1); /* ['A', 'B', 'C'] */Note: lGetRange is an alias for lRange and will be removed in future versions of phpredis.
Description: Removes the first count occurrences of the value element from the list. If count is zero, all the matching elements are removed. If count is negative, elements are removed from tail to head.
Note: The argument order is not the same as in the Redis documentation. This difference is kept for compatibility reasons.
key
value
count
LONG the number of elements to remove
BOOL FALSE if the value identified by key is not a list.
$redis->lPush('key1', 'A');
$redis->lPush('key1', 'B');
$redis->lPush('key1', 'C');
$redis->lPush('key1', 'A');
$redis->lPush('key1', 'A');
$redis->lRange('key1', 0, -1); /* ['A', 'A', 'C', 'B', 'A'] */
$redis->lRem('key1', 'A', 2); /* 2 */
$redis->lRange('key1', 0, -1); /* ['C', 'B', 'A'] */Note: lRemove is an alias for lRem and will be removed in future versions of phpredis.
Description: Set the list at index with the new value.
key
index
value
BOOL TRUE if the new value was set. FALSE if the index is out of range, or data type identified by key is not a list.
$redis->rPush('key1', 'A');
$redis->rPush('key1', 'B');
$redis->rPush('key1', 'C'); /* key1 => [ 'A', 'B', 'C' ] */
$redis->lindex('key1', 0); /* 'A' */
$redis->lSet('key1', 0, 'X');
$redis->lindex('key1', 0); /* 'X' */Description: Trims an existing list so that it will contain only a specified range of elements.
key
start
stop
Array
Bool return FALSE if the key identify a non-list value.
$redis->rPush('key1', 'A');
$redis->rPush('key1', 'B');
$redis->rPush('key1', 'C');
$redis->lRange('key1', 0, -1); /* ['A', 'B', 'C'] */
$redis->lTrim('key1', 0, 1);
$redis->lRange('key1', 0, -1); /* ['A', 'B'] */Note: listTrim is an alias for lTrim and will be removed in future versions of phpredis.
Description: Returns and removes the last element of the list.
key
STRING if command executed successfully
BOOL FALSE in case of failure (empty list)
$redis->rPush('key1', 'A');
$redis->rPush('key1', 'B');
$redis->rPush('key1', 'C'); /* key1 => [ 'A', 'B', 'C' ] */
$redis->rPop('key1'); /* key1 => [ 'A', 'B' ] */Description: Pops a value from the tail of a list, and pushes it to the front of another list. Also return this value. (redis >= 1.1)
Key: srckey
Key: dstkey
STRING The element that was moved in case of success, FALSE in case of failure.
$redis->del('x', 'y');
$redis->lPush('x', 'abc');
$redis->lPush('x', 'def');
$redis->lPush('y', '123');
$redis->lPush('y', '456');
// move the last of x to the front of y.
var_dump($redis->rPopLPush('x', 'y'));
var_dump($redis->lRange('x', 0, -1));
var_dump($redis->lRange('y', 0, -1));Output:
string(3) "abc"
array(1) {
[0]=>
string(3) "def"
}
array(3) {
[0]=>
string(3) "abc"
[1]=>
string(3) "456"
[2]=>
string(3) "123"
}
Description: Adds one or more entries to the tail of a LIST. Redis will create the list if it doesn't exist.
$redis->rPush($key, $entry [, $entry, $entry]);LONG The new length of the list in case of success, FALSE in case of Failure.
$redis->del('key1');
$redis->rPush('key1', 'A'); // returns 1
$redis->rPush('key1', 'B'); // returns 2
$redis->rPush('key1', 'C'); // returns 3
$redis->rPush('key1', 'D', 'E', 'F'); // returns 6
/* key1 now contains: [ 'A', 'B', 'C', 'D', 'E', 'F' ] */Description: Adds the string value to the tail (right) of the list if the list exists. FALSE in case of Failure.
key
value String, value to push in key
LONG The new length of the list in case of success, FALSE in case of Failure.
$redis->del('key1');
$redis->rPushX('key1', 'A'); // returns 0
$redis->rPush('key1', 'A'); // returns 1
$redis->rPushX('key1', 'B'); // returns 2
$redis->rPushX('key1', 'C'); // returns 3
/* key1 now points to the following list: [ 'A', 'B', 'C' ] */Description: Returns the size of a list identified by Key.
If the list didn't exist or is empty, the command returns 0. If the data type identified by Key is not a list, the command return FALSE.
Key
LONG The size of the list identified by Key exists.
BOOL FALSE if the data type identified by Key is not list
$redis->rPush('key1', 'A');
$redis->rPush('key1', 'B');
$redis->rPush('key1', 'C'); /* key1 => [ 'A', 'B', 'C' ] */
$redis->lLen('key1');/* 3 */
$redis->rPop('key1');
$redis->lLen('key1');/* 2 */Note: lSize is an alias for lLen and will be removed in future versions of phpredis.
- sAdd - Add one or more members to a set
- sCard, sSize - Get the number of members in a set
- sDiff - Subtract multiple sets
- sDiffStore - Subtract multiple sets and store the resulting set in a key
- sInter - Intersect multiple sets
- sInterStore - Intersect multiple sets and store the resulting set in a key
- sIsMember, sContains - Determine if a given value is a member of a set
- sMembers, sGetMembers - Get all the members in a set
- sMove - Move a member from one set to another
- sPop - Remove and return one or more members of a set at random
- sRandMember - Get one or multiple random members from a set
- sRem, sRemove - Remove one or more members from a set
- sUnion - Add multiple sets
- sUnionStore - Add multiple sets and store the resulting set in a key
- sScan - Scan a set for members
Description: Adds a value to the set value stored at key. If this value is already in the set, FALSE is returned.
key
value
LONG the number of elements added to the set.
$redis->sAdd('key1' , 'member1'); /* 1, 'key1' => {'member1'} */
$redis->sAdd('key1' , 'member2', 'member3'); /* 2, 'key1' => {'member1', 'member2', 'member3'}*/
$redis->sAdd('key1' , 'member2'); /* 0, 'key1' => {'member1', 'member2', 'member3'}*/Description: Returns the cardinality of the set identified by key.
key
LONG the cardinality of the set identified by key, 0 if the set doesn't exist.
$redis->sAdd('key1' , 'member1');
$redis->sAdd('key1' , 'member2');
$redis->sAdd('key1' , 'member3'); /* 'key1' => {'member1', 'member2', 'member3'}*/
$redis->sCard('key1'); /* 3 */
$redis->sCard('keyX'); /* 0 */Note: sSize is an alias for sCard and will be removed in future versions of phpredis.
Description: Performs the difference between N sets and returns it.
Keys: key1, key2, ... , keyN: Any number of keys corresponding to sets in redis.
Array of strings: The difference of the first set will all the others.
$redis->del('s0', 's1', 's2');
$redis->sAdd('s0', '1');
$redis->sAdd('s0', '2');
$redis->sAdd('s0', '3');
$redis->sAdd('s0', '4');
$redis->sAdd('s1', '1');
$redis->sAdd('s2', '3');
var_dump($redis->sDiff('s0', 's1', 's2'));Return value: all elements of s0 that are neither in s1 nor in s2.
array(2) {
[0]=>
string(1) "4"
[1]=>
string(1) "2"
}
Description: Performs the same action as sDiff, but stores the result in the first key
Key: dstkey, the key to store the diff into.
Keys: key1, key2, ... , keyN: Any number of keys corresponding to sets in redis
INTEGER: The cardinality of the resulting set, or FALSE in case of a missing key.
$redis->del('s0', 's1', 's2');
$redis->sAdd('s0', '1');
$redis->sAdd('s0', '2');
$redis->sAdd('s0', '3');
$redis->sAdd('s0', '4');
$redis->sAdd('s1', '1');
$redis->sAdd('s2', '3');
var_dump($redis->sDiffStore('dst', 's0', 's1', 's2'));
var_dump($redis->sMembers('dst'));Return value: the number of elements of s0 that are neither in s1 nor in s2.
int(2)
array(2) {
[0]=>
string(1) "4"
[1]=>
string(1) "2"
}
Description: Returns the members of a set resulting from the intersection of all the sets held at the specified keys.
If just a single key is specified, then this command produces the members of this set. If one of the keys
is missing, FALSE is returned.
key1, key2, keyN: keys identifying the different sets on which we will apply the intersection.
Array, contain the result of the intersection between those keys. If the intersection between the different sets is empty, the return value will be empty array.
$redis->sAdd('key1', 'val1');
$redis->sAdd('key1', 'val2');
$redis->sAdd('key1', 'val3');
$redis->sAdd('key1', 'val4');
$redis->sAdd('key2', 'val3');
$redis->sAdd('key2', 'val4');
$redis->sAdd('key3', 'val3');
$redis->sAdd('key3', 'val4');
var_dump($redis->sInter('key1', 'key2', 'key3'));Output:
array(2) {
[0]=>
string(4) "val4"
[1]=>
string(4) "val3"
}
Description: Performs a sInter command and stores the result in a new set.
Key: dstkey, the key to store the diff into.
Keys: key1, key2... keyN. key1..keyN are intersected as in sInter.
INTEGER: The cardinality of the resulting set, or FALSE in case of a missing key.
$redis->sAdd('key1', 'val1');
$redis->sAdd('key1', 'val2');
$redis->sAdd('key1', 'val3');
$redis->sAdd('key1', 'val4');
$redis->sAdd('key2', 'val3');
$redis->sAdd('key2', 'val4');
$redis->sAdd('key3', 'val3');
$redis->sAdd('key3', 'val4');
var_dump($redis->sInterStore('output', 'key1', 'key2', 'key3'));
var_dump($redis->sMembers('output'));Output:
int(2)
array(2) {
[0]=>
string(4) "val4"
[1]=>
string(4) "val3"
}
Description: Checks if value is a member of the set stored at the key key.
key
value
BOOL TRUE if value is a member of the set at key key, FALSE otherwise.
$redis->sAdd('key1' , 'member1');
$redis->sAdd('key1' , 'member2');
$redis->sAdd('key1' , 'member3'); /* 'key1' => {'member1', 'member2', 'member3'}*/
$redis->sIsMember('key1', 'member1'); /* TRUE */
$redis->sIsMember('key1', 'memberX'); /* FALSE */Note: sContains is an alias for sIsMember and will be removed in future versions of phpredis.
Description: Returns the contents of a set.
Key: key
An array of elements, the contents of the set.
$redis->del('s');
$redis->sAdd('s', 'a');
$redis->sAdd('s', 'b');
$redis->sAdd('s', 'a');
$redis->sAdd('s', 'c');
var_dump($redis->sMembers('s'));Output:
array(3) {
[0]=>
string(1) "c"
[1]=>
string(1) "a"
[2]=>
string(1) "b"
}
The order is random and corresponds to redis' own internal representation of the set structure.
Note: sGetMembers is an alias for sMembers and will be removed in future versions of phpredis.
Description: Moves the specified member from the set at srcKey to the set at dstKey.
srcKey
dstKey
member
BOOL If the operation is successful, return TRUE. If the srcKey and/or dstKey didn't exist, and/or the member didn't exist in srcKey, FALSE is returned.
$redis->sAdd('key1' , 'member11');
$redis->sAdd('key1' , 'member12');
$redis->sAdd('key1' , 'member13'); /* 'key1' => {'member11', 'member12', 'member13'}*/
$redis->sAdd('key2' , 'member21');
$redis->sAdd('key2' , 'member22'); /* 'key2' => {'member21', 'member22'}*/
$redis->sMove('key1', 'key2', 'member13'); /* 'key1' => {'member11', 'member12'} */
/* 'key2' => {'member21', 'member22', 'member13'} */Description: Removes and returns a random element from the set value at Key.
key
count: Integer, optional
String "popped" value
Bool FALSE if set identified by key is empty or doesn't exist.
Array: Member(s) returned or an empty array if the set doesn't exist
Bool: FALSE on error if the key is not a set
$redis->sAdd('key1' , 'member1');
$redis->sAdd('key1' , 'member2');
$redis->sAdd('key1' , 'member3'); /* 'key1' => {'member3', 'member1', 'member2'}*/
$redis->sPop('key1'); /* 'member1', 'key1' => {'member3', 'member2'} */
$redis->sPop('key1'); /* 'member3', 'key1' => {'member2'} */
/* With count */
$redis->sAdd('key2', 'member1', 'member2', 'member3');
$redis->sPop('key2', 3); /* Will return all members but in no particular order */Description: Returns a random element from the set value at Key, without removing it.
key
count (Integer, optional)
If no count is provided, a random String value from the set will be returned. If a count
is provided, an array of values from the set will be returned. Read about the different
ways to use the count here: SRANDMEMBER
Bool FALSE if set identified by key is empty or doesn't exist.
$redis->sAdd('key1' , 'member1');
$redis->sAdd('key1' , 'member2');
$redis->sAdd('key1' , 'member3'); /* 'key1' => {'member3', 'member1', 'member2'}*/
// No count
$redis->sRandMember('key1'); /* 'member1', 'key1' => {'member3', 'member1', 'member2'} */
$redis->sRandMember('key1'); /* 'member3', 'key1' => {'member3', 'member1', 'member2'} */
// With a count
$redis->sRandMember('key1', 3); // Will return an array with all members from the set
$redis->sRandMember('key1', 2); // Will an array with 2 members of the set
$redis->sRandMember('key1', -100); // Will return an array of 100 elements, picked from our set (with dups)
$redis->sRandMember('empty-set', 100); // Will return an empty array
$redis->sRandMember('not-a-set', 100); // Will return FALSEDescription: Removes the specified member from the set value stored at key.
key
member
LONG The number of elements removed from the set.
$redis->sAdd('key1' , 'member1');
$redis->sAdd('key1' , 'member2');
$redis->sAdd('key1' , 'member3'); /* 'key1' => {'member1', 'member2', 'member3'}*/
$redis->sRem('key1', 'member2', 'member3'); /*return 2. 'key1' => {'member1'} */Note: sRemove is an alias for sRem and will be removed in future versions of phpredis.
Description: Performs the union between N sets and returns it.
Keys: key1, key2, ... , keyN: Any number of keys corresponding to sets in redis.
Array of strings: The union of all these sets.
Note: sUnion can also take a single array with keys (see example below).
$redis->del('s0', 's1', 's2');
$redis->sAdd('s0', '1');
$redis->sAdd('s0', '2');
$redis->sAdd('s1', '3');
$redis->sAdd('s1', '1');
$redis->sAdd('s2', '3');
$redis->sAdd('s2', '4');
/* Get the union with variadic arguments */
var_dump($redis->sUnion('s0', 's1', 's2'));
/* Pass a single array */
var_dump($redis->sUnion(['s0', 's1', 's2']);Return value: all elements that are either in s0 or in s1 or in s2.
array(4) {
[0]=>
string(1) "3"
[1]=>
string(1) "4"
[2]=>
string(1) "1"
[3]=>
string(1) "2"
}
Description: Performs the same action as sUnion, but stores the result in the first key
Key: dstkey, the key to store the diff into.
Keys: key1, key2, ... , keyN: Any number of keys corresponding to sets in redis.
INTEGER: The cardinality of the resulting set, or FALSE in case of a missing key.
$redis->del('s0', 's1', 's2');
$redis->sAdd('s0', '1');
$redis->sAdd('s0', '2');
$redis->sAdd('s1', '3');
$redis->sAdd('s1', '1');
$redis->sAdd('s2', '3');
$redis->sAdd('s2', '4');
var_dump($redis->sUnionStore('dst', 's0', 's1', 's2'));
var_dump($redis->sMembers('dst'));Return value: the number of elements that are either in s0 or in s1 or in s2.
int(4)
array(4) {
[0]=>
string(1) "3"
[1]=>
string(1) "4"
[2]=>
string(1) "1"
[3]=>
string(1) "2"
}
Description: Scan a set for members
Key: The set to search
iterator: LONG (reference) to the iterator as we go
pattern: String, optional pattern to match against
count: How many members to return at a time (Redis might return a different amount)
Array, boolean: PHPRedis will return an array of keys or FALSE when we're done iterating
$it = NULL;
$redis->setOption(Redis::OPT_SCAN, Redis::SCAN_RETRY); /* don't return empty results until we're done */
while($arr_mems = $redis->sScan('set', $it, "*pattern*")) {
foreach($arr_mems as $str_mem) {
echo "Member: $str_mem\n";
}
}
$it = NULL;
$redis->setOption(Redis::OPT_SCAN, Redis::SCAN_NORETRY); /* return after each iteration, even if empty */
while(($arr_mems = $redis->sScan('set', $it, "*pattern*"))!==FALSE) {
if(count($arr_mems) > 0) {
foreach($arr_mems as $str_mem) {
echo "Member found: $str_mem\n";
}
} else {
echo "No members in this iteration, iterator value: $it\n";
}
}- bzPop - Block until Redis can pop the highest or lowest scoring member from one or more ZSETs.
- zAdd - Add one or more members to a sorted set or update its score if it already exists
- zCard, zSize - Get the number of members in a sorted set
- zCount - Count the members in a sorted set with scores within the given values
- zIncrBy - Increment the score of a member in a sorted set
- zinterstore, zInter - Intersect multiple sorted sets and store the resulting sorted set in a new key
- zPop - Redis can pop the highest or lowest scoring member from one a ZSET.
- zRange - Return a range of members in a sorted set, by index
- zRangeByScore, zRevRangeByScore - Return a range of members in a sorted set, by score
- zRangeByLex - Return a lexicographical range from members that share the same score
- zRank, zRevRank - Determine the index of a member in a sorted set
- zRem, zDelete, zRemove - Remove one or more members from a sorted set
- zRemRangeByRank, zDeleteRangeByRank - Remove all members in a sorted set within the given indexes
- zRemRangeByScore, zDeleteRangeByScore, zRemoveRangeByScore - Remove all members in a sorted set within the given scores
- zRevRange - Return a range of members in a sorted set, by index, with scores ordered from high to low
- zScore - Get the score associated with the given member in a sorted set
- zunionstore, zUnion - Add multiple sorted sets and store the resulting sorted set in a new key
- zScan - Scan a sorted set for members
Description: Block until Redis can pop the highest or lowest scoring members from one or more ZSETs. There are two commands (BZPOPMIN and BZPOPMAX for popping the lowest and highest scoring elements respectively.)
$redis->bzPopMin(array $keys, int $timeout): array
$redis->bzPopMax(array $keys, int $timeout): array
$redis->bzPopMin(string $key1, string $key2, ... int $timeout): array
$redis->bzPopMax(string $key1, string $key2, ... int $timeout): arrayARRAY: Either an array with the key member and score of the highest or lowest element or an empty array if the timeout was reached without an element to pop.
/* Wait up to 5 seconds to pop the *lowest* scoring member from sets `zs1` and `zs2`. */
$redis->bzPopMin(['zs1', 'zs2'], 5);
$redis->bzPopMin('zs1', 'zs2', 5);
/* Wait up to 5 seconds to pop the *highest* scoring member from sets `zs1` and `zs2` */
$redis->bzPopMax(['zs1', 'zs2'], 5);
$redis->bzPopMax('zs1', 'zs2', 5);Note: Calling these functions with an array of keys or with a variable number of arguments is functionally identical.
Description: Add one or more members to a sorted set or update its score if it already exists
key
score: double
value: string
Long 1 if the element is added. 0 otherwise.
$redis->zAdd('key', 1, 'val1');
$redis->zAdd('key', 0, 'val0');
$redis->zAdd('key', 5, 'val5');
$redis->zRange('key', 0, -1); // [val0, val1, val5]Description: Returns the cardinality of an ordered set.
key
Long, the set's cardinality
$redis->zAdd('key', 0, 'val0');
$redis->zAdd('key', 2, 'val2');
$redis->zAdd('key', 10, 'val10');
$redis->zCard('key'); /* 3 */Note: zSize is an alias for zCard and will be removed in future versions of phpredis.
Description: Returns the number of elements of the sorted set stored at the specified key which have scores in the range [start,end]. Adding a parenthesis before start or end excludes it from the range. +inf and -inf are also valid limits.
key
start: string
end: string
LONG the size of a corresponding zRangeByScore.
$redis->zAdd('key', 0, 'val0');
$redis->zAdd('key', 2, 'val2');
$redis->zAdd('key', 10, 'val10');
$redis->zCount('key', 0, 3); /* 2, corresponding to ['val0', 'val2'] */Description: Increments the score of a member from a sorted set by a given amount.
key
value: (double) value that will be added to the member's score
member
DOUBLE the new value
$redis->del('key');
$redis->zIncrBy('key', 2.5, 'member1'); /* key or member1 didn't exist, so member1's score is to 0 before the increment */
/* and now has the value 2.5 */
$redis->zIncrBy('key', 1, 'member1'); /* 3.5 */Description: Creates an intersection of sorted sets given in second argument. The result of the union will be stored in the sorted set defined by the first argument.
The third optional argument defines weights to apply to the sorted sets in input. In this case, the weights will be multiplied by the score of each element in the sorted set before applying the aggregation.
The forth argument defines the AGGREGATE option which specify how the results of the union are aggregated.
keyOutput
arrayZSetKeys
arrayWeights
aggregateFunction Either "SUM", "MIN", or "MAX": defines the behaviour to use on duplicate entries during the zinterstore.
LONG The number of values in the new sorted set.
$redis->del('k1');
$redis->del('k2');
$redis->del('k3');
$redis->del('ko1');
$redis->del('ko2');
$redis->del('ko3');
$redis->del('ko4');
$redis->zAdd('k1', 0, 'val0');
$redis->zAdd('k1', 1, 'val1');
$redis->zAdd('k1', 3, 'val3');
$redis->zAdd('k2', 2, 'val1');
$redis->zAdd('k2', 3, 'val3');
$redis->zinterstore('ko1', ['k1', 'k2']); /* 2, 'ko1' => ['val1', 'val3'] */
$redis->zinterstore('ko2', ['k1', 'k2'], [1, 1]); /* 2, 'ko2' => ['val1', 'val3'] */
/* Weighted zinterstore */
$redis->zinterstore('ko3', ['k1', 'k2'], [1, 5], 'min'); /* 2, 'ko3' => ['val1', 'val3'] */
$redis->zinterstore('ko4', ['k1', 'k2'], [1, 5], 'max'); /* 2, 'ko4' => ['val3', 'val1'] */Note: zInter is an alias for zinterstore and will be removed in future versions of phpredis.
Description: Can pop the highest or lowest scoring members from one ZSETs. There are two commands (ZPOPMIN and ZPOPMAX for popping the lowest and highest scoring elements respectively.)
$redis->zPopMin(string $key, int $count): array
$redis->zPopMax(string $key, int $count): array
$redis->zPopMin(string $key, int $count): array
$redis->zPopMax(string $key, int $count): arrayARRAY: Either an array with the key member and score of the highest or lowest element or an empty array if there is no element available.
/* Pop the *lowest* scoring member from set `zs1`. */
$redis->zPopMin('zs1', 5);
/* Pop the *highest* scoring member from set `zs1`. */
$redis->zPopMax('zs1', 5);Description: Returns a range of elements from the ordered set stored at the specified key, with values in the range [start, end].
Start and stop are interpreted as zero-based indices:
0 the first element, 1 the second ...
-1 the last element, -2 the penultimate ...
key
start: long
end: long
withscores: bool = false
Array containing the values in specified range.
$redis->zAdd('key1', 0, 'val0');
$redis->zAdd('key1', 2, 'val2');
$redis->zAdd('key1', 10, 'val10');
$redis->zRange('key1', 0, -1); /* ['val0', 'val2', 'val10'] */
// with scores
$redis->zRange('key1', 0, -1, true); /* ['val0' => 0, 'val2' => 2, 'val10' => 10] */Description: Returns the elements of the sorted set stored at the specified key which have scores in the range [start,end]. Adding a parenthesis before start or end excludes it from the range. +inf and -inf are also valid limits. zRevRangeByScore returns the same items in reverse order, when the start and end parameters are swapped.
key
start: string
end: string
options: array
Two options are available: withscores => TRUE, and limit => [$offset, $count]
Array containing the values in specified range.
$redis->zAdd('key', 0, 'val0');
$redis->zAdd('key', 2, 'val2');
$redis->zAdd('key', 10, 'val10');
$redis->zRangeByScore('key', 0, 3); /* ['val0', 'val2'] */
$redis->zRangeByScore('key', 0, 3, ['withscores' => TRUE]); /* ['val0' => 0, 'val2' => 2] */
$redis->zRangeByScore('key', 0, 3, ['limit' => [1, 1]]); /* ['val2'] */
$redis->zRangeByScore('key', 0, 3, ['withscores' => TRUE, 'limit' => [1, 1]]); /* ['val2' => 2] */Description: Returns a lexicographical range of members in a sorted set, assuming the members have the same score. The min and max values are required to start with '(' (exclusive), '[' (inclusive), or be exactly the values '-' (negative inf) or '+' (positive inf). The command must be called with either three or five arguments or will return FALSE.
key: The ZSET you wish to run against
min: The minimum alphanumeric value you wish to get
max: The maximum alphanumeric value you wish to get
offset: Optional argument if you wish to start somewhere other than the first element.
limit: Optional argument if you wish to limit the number of elements returned.
Array containing the values in the specified range.
foreach(['a','b','c','d','e','f','g'] as $c)
$redis->zAdd('key',0,$c);
$redis->zRangeByLex('key','-','[c') /* ['a','b','c']; */
$redis->zRangeByLex('key','-','(c') /* ['a','b'] */
$redis->zRangeByLex('key','-','[c',1,2) /* ['b','c'] */Description: Returns the rank of a given member in the specified sorted set, starting at 0 for the item with the smallest score. zRevRank starts at 0 for the item with the largest score.
key
member
Long, the item's score.
$redis->del('z');
$redis->zAdd('key', 1, 'one');
$redis->zAdd('key', 2, 'two');
$redis->zRank('key', 'one'); /* 0 */
$redis->zRank('key', 'two'); /* 1 */
$redis->zRevRank('key', 'one'); /* 1 */
$redis->zRevRank('key', 'two'); /* 0 */Description: Delete one or more members from a sorted set.
$redis->zRem($key, $member [, $member ...]);LONG: The number of members deleted.
$redis->zAdd('key', 0, 'val0', 1, 'val1', 2, 'val2');
$redis->zRem('key', 'val0', 'val1', 'val2'); // Returns: 3Note: zDelete and zRemove are an alias for zRem and will be removed in future versions of phpredis.
Description: Deletes the elements of the sorted set stored at the specified key which have rank in the range [start,end].
key
start: LONG
end: LONG
LONG The number of values deleted from the sorted set
$redis->zAdd('key', 1, 'one');
$redis->zAdd('key', 2, 'two');
$redis->zAdd('key', 3, 'three');
$redis->zRemRangeByRank('key', 0, 1); /* 2 */
$redis->zRange('key', 0, -1, ['withscores' => TRUE]); /* ['three' => 3] */Note: zDeleteRangeByRank is an alias for zRemRangeByRank and will be removed in future versions of phpredis.
Description: Deletes the elements of the sorted set stored at the specified key which have scores in the range [start,end].
key
start: double or "+inf" or "-inf" string
end: double or "+inf" or "-inf" string
LONG The number of values deleted from the sorted set
$redis->zAdd('key', 0, 'val0');
$redis->zAdd('key', 2, 'val2');
$redis->zAdd('key', 10, 'val10');
$redis->zRemRangeByScore('key', 0, 3); /* 2 */Note: zDeleteRangeByScore and zRemoveRangeByScore are an alias for zRemRangeByScore and will be removed in future versions of phpredis.
Description: Returns the elements of the sorted set stored at the specified key in the range [start, end] in reverse order. start and stop are interpreted as zero-based indices:
0 the first element, 1 the second ...
-1 the last element, -2 the penultimate ...
key
start: long
end: long
withscores: bool = false
Array containing the values in specified range.
$redis->zAdd('key', 0, 'val0');
$redis->zAdd('key', 2, 'val2');
$redis->zAdd('key', 10, 'val10');
$redis->zRevRange('key', 0, -1); /* ['val10', 'val2', 'val0'] */
// with scores
$redis->zRevRange('key', 0, -1, true); /* ['val10' => 10, 'val2' => 2, 'val0' => 0] */Description: Returns the score of a given member in the specified sorted set.
key
member
Double
$redis->zAdd('key', 2.5, 'val2');
$redis->zScore('key', 'val2'); /* 2.5 */Description: Creates an union of sorted sets given in second argument. The result of the union will be stored in the sorted set defined by the first argument.
The third optional argument defines weights to apply to the sorted sets in input. In this case, the weights will be multiplied by the score of each element in the sorted set before applying the aggregation.
The forth argument defines the AGGREGATE option which specify how the results of the union are aggregated.
keyOutput
arrayZSetKeys
arrayWeights
aggregateFunction Either "SUM", "MIN", or "MAX": defines the behaviour to use on duplicate entries during the zunionstore.
LONG The number of values in the new sorted set.
$redis->del('k1');
$redis->del('k2');
$redis->del('k3');
$redis->del('ko1');
$redis->del('ko2');
$redis->del('ko3');
$redis->zAdd('k1', 0, 'val0');
$redis->zAdd('k1', 1, 'val1');
$redis->zAdd('k2', 2, 'val2');
$redis->zAdd('k2', 3, 'val3');
$redis->zunionstore('ko1', ['k1', 'k2']); /* 4, 'ko1' => ['val0', 'val1', 'val2', 'val3'] */
/* Weighted zunionstore */
$redis->zunionstore('ko2', ['k1', 'k2'], [1, 1]); /* 4, 'ko2' => ['val0', 'val1', 'val2', 'val3'] */
$redis->zunionstore('ko3', ['k1', 'k2'], [5, 1]); /* 4, 'ko3' => ['val0', 'val2', 'val3', 'val1'] */Note: zUnion is an alias for zunionstore and will be removed in future versions of phpredis.
Description: Scan a sorted set for members, with optional pattern and count
key: String, the set to scan
iterator: Long (reference), initialized to NULL
pattern: String (optional), the pattern to match
count: How many keys to return per iteration (Redis might return a different number)
Array, boolean PHPRedis will return matching keys from Redis, or FALSE when iteration is complete
$it = NULL;
$redis->setOption(Redis::OPT_SCAN, Redis::SCAN_RETRY);
while($arr_matches = $redis->zScan('zset', $it, '*pattern*')) {
foreach($arr_matches as $str_mem => $f_score) {
echo "Key: $str_mem, Score: $f_score\n";
}
}Description: Adds the specified elements to the specified HyperLogLog.
$redis->pfAdd($key, Array $elements);Key
Array of values
Integer: 1 if at least 1 HyperLogLog internal register was altered. 0 otherwise.
$redis->pfAdd('hll', ['a', 'b', 'c']); // (int) 1
$redis->pfAdd('hll', ['a', 'b']); // (int) 0Description: Return the approximated cardinality of the set(s) observed by the HyperLogLog at key(s).
$redis->pfCount($key);
$redis->pfCount(Array $keys);Key or Array of keys
Integer: The approximated number of unique elements observed via pfAdd.
$redis->pfAdd('hll1', ['a', 'b', 'c']); // (int) 1
$redis->pfCount('hll1'); // (int) 3
$redis->pfAdd('hll2', ['d', 'e', 'a']); // (int) 1
$redis->pfCount('hll2'); // (int) 3
$redis->pfCount(['hll1', 'hll2']); // (int) 5Description: Merge N different HyperLogLogs into a single one.
$redis->pfMerge($destkey, Array $sourceKeys);Destination Key
Array of Source Keys
BOOL: TRUE on success, FALSE on error.
$redis->pfAdd('hll1', ['a', 'b', 'c']); // (int) 1
$redis->pfAdd('hll2', ['d', 'e', 'a']); // (int) 1
$redis->pfMerge('hll3', ['hll1', 'hll2']); // true
$redis->pfCount('hll3'); // (int) 5$redis->geoAdd($key, $longitude, $latitude, $member [, $longitude, $latitude, $member, ...]);Description: Add one or more geospatial items to the specified key. This function must be called with at least one longitude, latitude, member triplet.
Integer: The number of elements added to the geospatial key.
$redis->del("myplaces");
/* Since the key will be new, $result will be 2 */
$result = $redis->geoAdd(
"myplaces",
-122.431, 37.773, "San Francisco",
-157.858, 21.315, "Honolulu"
);$redis->geoHash($key, $member [, $member, $member, ...]);Description: Retrieve Geohash strings for one or more elements of a geospatial index.
Array: One or more Redis Geohash encoded strings.
$redis->geoAdd("hawaii", -157.858, 21.306, "Honolulu", -156.331, 20.798, "Maui");
$hashes = $redis->geoHash("hawaii", "Honolulu", "Maui");
var_dump($hashes);array(2) {
[0]=>
string(11) "87z9pyek3y0"
[1]=>
string(11) "8e8y6d5jps0"
}
$redis->geoPos($key, $member [, $member, $member, ...]);Description: Return longitude, latitude positions for each requested member.
Array: One or more longitude/latitude positions
$redis->geoAdd("hawaii", -157.858, 21.306, "Honolulu", -156.331, 20.798, "Maui");
$positions = $redis->geoPos("hawaii", "Honolulu", "Maui");
var_dump($positions);array(2) {
[0]=>
array(2) {
[0]=>
string(22) "-157.85800248384475708"
[1]=>
string(19) "21.3060004581273077"
}
[1]=>
array(2) {
[0]=>
string(22) "-156.33099943399429321"
[1]=>
string(20) "20.79799924753607598"
}
}
$redis->geoDist($key, $member1, $member2 [, $unit]);Description: Return the distance between two members in a geospatial set. If units are passed it must be one of the following values:
- 'm' => Meters
- 'km' => Kilometers
- 'mi' => Miles
- 'ft' => Feet
Double: The distance between the two passed members in the units requested (meters by default).
$redis->geoAdd("hawaii", -157.858, 21.306, "Honolulu", -156.331, 20.798, "Maui");
$meters = $redis->geoDist("hawaii", "Honolulu", "Maui");
$kilometers = $redis->geoDist("hawaii", "Honolulu", "Maui", 'km');
$miles = $redis->geoDist("hawaii", "Honolulu", "Maui", 'mi');
$feet = $redis->geoDist("hawaii", "Honolulu", "Maui", 'ft');
echo "Distance between Honolulu and Maui:\n";
echo " meters : $meters\n";
echo " kilometers: $kilometers\n";
echo " miles : $miles\n";
echo " feet : $feet\n";
/* Bad unit */
$inches = $redis->geoDist("hawaii", "Honolulu", "Maui", 'in');
echo "Invalid unit returned:\n";
var_dump($inches);Distance between Honolulu and Maui:
meters : 168275.204
kilometers: 168.2752
miles : 104.5616
feet : 552084.0028
Invalid unit returned:
bool(false)
$redis->geoRadius($key, $longitude, $latitude, $radius, $unit [, Array $options]);Description: Return members of a set with geospatial information that are within the radius specified by the caller.
The georadius command can be called with various options that control how Redis returns results. The following table describes the options phpredis supports. All options are case insensitive.
| Key | Value | Description |
|---|---|---|
| COUNT | integer > 0 | Limit how many results are returned |
| WITHCOORD | Return longitude and latitude of matching members | |
| WITHDIST | Return the distance from the center | |
| WITHHASH | Return the raw geohash-encoded score | |
| ASC | Sort results in ascending order | |
| DESC | Sort results in descending order | |
| STORE | key | Store results in key |
| STOREDIST | key | Store the results as distances in key |
Note: It doesn't make sense to pass both ASC and DESC options but if both are passed the last one passed will be used.
Note: When using STORE[DIST] in Redis Cluster, the store key must has to the same slot as the query key or you will get a CROSSLOT error.
Mixed: When no STORE option is passed, this function returns an array of results. If it is passed this function returns the number of stored entries.
/* Add some cities */
$redis->geoAdd("hawaii", -157.858, 21.306, "Honolulu", -156.331, 20.798, "Maui");
echo "Within 300 miles of Honolulu:\n";
var_dump($redis->geoRadius("hawaii", -157.858, 21.306, 300, 'mi'));
echo "\nWithin 300 miles of Honolulu with distances:\n";
$options = ['WITHDIST'];
var_dump($redis->geoRadius("hawaii", -157.858, 21.306, 300, 'mi', $options));
echo "\nFirst result within 300 miles of Honolulu with distances:\n";
$options['count'] = 1;
var_dump($redis->geoRadius("hawaii", -157.858, 21.306, 300, 'mi', $options));
echo "\nFirst result within 300 miles of Honolulu with distances in descending sort order:\n";
$options[] = 'DESC';
var_dump($redis->geoRadius("hawaii", -157.858, 21.306, 300, 'mi', $options));Within 300 miles of Honolulu:
array(2) {
[0]=>
string(8) "Honolulu"
[1]=>
string(4) "Maui"
}
Within 300 miles of Honolulu with distances:
array(2) {
[0]=>
array(2) {
[0]=>
string(8) "Honolulu"
[1]=>
string(6) "0.0002"
}
[1]=>
array(2) {
[0]=>
string(4) "Maui"
[1]=>
string(8) "104.5615"
}
}
First result within 300 miles of Honolulu with distances:
array(1) {
[0]=>
array(2) {
[0]=>
string(8) "Honolulu"
[1]=>
string(6) "0.0002"
}
}
First result within 300 miles of Honolulu with distances in descending sort order:
array(1) {
[0]=>
array(2) {
[0]=>
string(4) "Maui"
[1]=>
string(8) "104.5615"
}
}
$redis->geoRadiusByMember($key, $member, $radius, $units [, Array $options]);Description: This method is identical to geoRadius except that instead of passing a longitude and latitude as the "source" you pass an existing member in the geospatial set.
See geoRadius command for options array.
Array: The zero or more entries that are close enough to the member given the distance and radius specified.
$redis->geoAdd("hawaii", -157.858, 21.306, "Honolulu", -156.331, 20.798, "Maui");
echo "Within 300 miles of Honolulu:\n";
var_dump($redis->geoRadiusByMember("hawaii", "Honolulu", 300, 'mi'));
echo "\nFirst match within 300 miles of Honolulu:\n";
var_dump($redis->geoRadiusByMember("hawaii", "Honolulu", 300, 'mi', ['count' => 1]));Within 300 miles of Honolulu:
array(2) {
[0]=>
string(8) "Honolulu"
[1]=>
string(4) "Maui"
}
First match within 300 miles of Honolulu:
array(1) {
[0]=>
string(8) "Honolulu"
}
- xAck - Acknowledge one or more pending messages
- xAdd - Add a message to a stream
- xClaim - Acquire ownership of a pending message
- xDel - Remove a message from a stream
- xGroup - Manage consumer groups
- xInfo - Get information about a stream
- xLen - Get the length of a stream
- xPending - Inspect pending messages in a stream
- xRange - Query a range of messages from a stream
- xRead - Read message(s) from a stream
- xReadGroup - Read stream messages with a group and consumer
- xRevRange - Query one or more messages from end to start
- xTrim - Trim a stream's size
$obj_redis->xAck($stream, $group, $arr_messages);Description: Acknowledge one or more messages on behalf of a consumer group.
long: The number of messages Redis reports as acknowledged.
$obj_redis->xAck('stream', 'group1', ['1530063064286-0', '1530063064286-1']);$obj_redis->xAdd($str_key, $str_id, $arr_message[, $i_maxlen, $boo_approximate]);Description: Add a message to a stream
String: The added message ID
$obj_redis->xAdd('mystream', "*", ['field' => 'value']);
$obj_redis->xAdd('mystream', "*", ['field' => 'value'], 1000); // set max length of stream to 1000
$obj_redis->xAdd('mystream', "*", ['field' => 'value'], 1000, true); // set max length of stream to ~1000$obj_redis->xClaim($str_key, $str_group, $str_consumer, $min_idle_time, $arr_ids, [$arr_options]);Description: Claim ownership of one or more pending messages.
$options = [
/* Note: 'TIME', and 'IDLE' are mutually exclusive */
'IDLE' => $value, /* Set the idle time to $value ms */,
'TIME' => $value, /* Set the idle time to now - $value */
'RETRYCOUNT' => $value, /* Update message retrycount to $value */
'FORCE', /* Claim the message(s) even if they're not pending anywhere */
'JUSTID', /* Instruct Redis to only return IDs */
];Array: Either an array of message IDs along with corresponding data, or just an array of IDs (if the 'JUSTID' option was passed).
$ids = ['1530113681011-0', '1530113681011-1', '1530113681011-2'];
/* Without any options */
$obj_redis->xClaim(
'mystream', 'group1', 'myconsumer1', 0, $ids
);
/* With options */
$obj_redis->xClaim(
'mystream', 'group1', 'myconsumer2', 0, $ids,
[
'IDLE' => time() * 1000,
'RETRYCOUNT' => 5,
'FORCE',
'JUSTID'
]
);$obj_redis->xDel($str_key, $arr_ids);Description: Delete one or more messages from a stream.
long: The number of messages removed
$obj_redis->xDel('mystream', ['1530115304877-0', '1530115305731-0']);$obj_redis->xGroup('HELP');
$obj_redis->xGroup('CREATE', $str_key, $str_group, $str_msg_id, [$boo_mkstream]);
$obj_redis->xGroup('SETID', $str_key, $str_group, $str_msg_id);
$obj_redis->xGroup('DESTROY', $str_key, $str_group);
$obj_redis->xGroup('DELCONSUMER', $str_key, $str_group, $str_consumer_name);Description: This command is used in order to create, destroy, or manage consumer groups.
Mixed: This command returns different types depending on the specific XGROUP command executed.
$obj_redis->xGroup('CREATE', 'mystream', 'mygroup', 0);
$obj_redis->xGroup('CREATE', 'mystream', 'mygroup2', 0, true); /* Create stream if non-existent. */
$obj_redis->xGroup('DESTROY', 'mystream', 'mygroup');$obj_redis->xInfo('CONSUMERS', $str_stream, $str_group);
$obj_redis->xInfo('GROUPS', $str_stream);
$obj_redis->xInfo('STREAM', $str_stream [, 'FULL' [, $i_count]]);
$obj_redis->xInfo('HELP');Description: Get information about a stream or consumer groups.
Mixed: This command returns different types depending on which subcommand is used.
$obj_redis->xInfo('STREAM', 'mystream');
$obj_redis->xInfo('STREAM', 'mystream', 'FULL', 10);$obj_redis->xLen($str_stream);Description: Get the length of a given stream
Long: The number of messages in the stream.
$obj_redis->xLen('mystream');$obj_redis->xPending($str_stream, $str_group [, $str_start, $str_end, $i_count, $str_consumer]);Description: Get information about pending messages in a given stream.
Array: Information about the pending messages, in various forms depending on the specific invocation of XPENDING.
$obj_redis->xPending('mystream', 'mygroup');
$obj_redis->xPending('mystream', 'mygroup', '-', '+', 1, 'consumer-1');$obj_redis->xRange($str_stream, $str_start, $str_end [, $i_count]);Description: Get a range of messages from a given stream.
Array: The messages in the stream within the requested range.
/* Get everything in this stream */
$obj_redis->xRange('mystream', '-', '+');
/* Only the first two messages */
$obj_redis->xRange('mystream', '-', '+', 2);$obj_redis->xRead($arr_streams [, $i_count, $i_block);Description: Read data from one or more streams and only return IDs greater than sent in the command.
Array: The messages in the stream newer than the IDs passed to Redis (if any).
$obj_redis->xRead(['stream1' => '1535222584555-0', 'stream2' => '1535222584555-0']);
/* --- Possible output ---
Array
(
[stream1] => Array
(
[1535222584555-1] => Array
(
[key:1] => val:1
)
)
[stream2] => Array
(
[1535222584555-1] => Array
(
[key:1] => val:1
)
)
)
*/
// Receive only new message ($ = last id) and wait for one new message unlimited time
$obj_redis->xRead(['stream1' => '$'], 1, 0);$obj_redis->xReadGroup($str_group, $str_consumer, $arr_streams [, $i_count, $i_block]);Description: This method is similar to xRead except that it supports reading messages for a specific consumer group.
Array: The messages delivered to this consumer group (if any).
/* Consume messages for 'mygroup', 'consumer1' */
$obj_redis->xReadGroup('mygroup', 'consumer1', ['s1' => 0, 's2' => 0]);
/* Consume messages for 'mygroup', 'consumer1' which were not consumed yet by the group */
$obj_redis->xReadGroup('mygroup', 'consumer1', ['s1' => '>', 's2' => '>']);
/* Read a single message as 'consumer2' wait for up to a second until a message arrives. */
$obj_redis->xReadGroup('mygroup', 'consumer2', ['s1' => 0, 's2' => 0], 1, 1000);$obj_redis->xRevRange($str_stream, $str_end, $str_start [, $i_count]);Description: This is identical to xRange except the results come back in reverse order. Also note that Redis reverses the order of "start" and "end".
Array: The messages in the range specified.
$obj_redis->xRevRange('mystream', '+', '-');$obj_redis->xTrim($str_stream, $i_max_len [, $boo_approximate]);Description: Trim the stream length to a given maximum. If the "approximate" flag is pasesed, Redis will use your size as a hint but only trim trees in whole nodes (this is more efficient).
long: The number of messages trimmed from the stream.
/* Trim to exactly 100 messages */
$obj_redis->xTrim('mystream', 100);
/* Let Redis approximate the trimming */
$obj_redis->xTrim('mystream', 100, true);- pSubscribe - Subscribe to channels by pattern
- publish - Post a message to a channel
- subscribe - Subscribe to channels
- pubSub - Introspection into the pub/sub subsystem
Description: Subscribe to channels by pattern
patterns: An array of patterns to match
callback: Either a string or an array with an object and method. The callback will get four arguments ($redis, $pattern, $channel, $message)
return value: Mixed. Any non-null return value in the callback will be returned to the caller.
function pSubscribe($redis, $pattern, $chan, $msg) {
echo "Pattern: $pattern\n";
echo "Channel: $chan\n";
echo "Payload: $msg\n";
}Description: Publish messages to channels. Warning: this function will probably change in the future.
channel: a channel to publish to
message: string
$redis->publish('chan-1', 'hello, world!'); // send message.Description: Subscribe to channels. Warning: this function will probably change in the future.
channels: an array of channels to subscribe to
callback: either a string or an Array($instance, 'method_name'). The callback function receives 3 parameters: the redis instance, the channel name, and the message.
return value: Mixed. Any non-null return value in the callback will be returned to the caller.
function f($redis, $chan, $msg) {
switch($chan) {
case 'chan-1':
...
break;
case 'chan-2':
...
break;
case 'chan-2':
...
break;
}
}
$redis->subscribe(['chan-1', 'chan-2', 'chan-3'], 'f'); // subscribe to 3 chansDescription: A command allowing you to get information on the Redis pub/sub system.
keyword: String, which can be: "channels", "numsub", or "numpat"
argument: Optional, variant. For the "channels" subcommand, you can pass a string pattern. For "numsub" an array of channel names.
CHANNELS: Returns an array where the members are the matching channels.
NUMSUB: Returns a key/value array where the keys are channel names and values are their counts.
NUMPAT: Integer return containing the number active pattern subscriptions
$redis->pubSub("channels"); /*All channels */
$redis->pubSub("channels", "*pattern*"); /* Just channels matching your pattern */
$redis->pubSub("numsub", ["chan1", "chan2"]); /*Get subscriber counts for 'chan1' and 'chan2'*/
$redis->pubSub("numpat"); /* Get the number of pattern subscribers */
- rawCommand - Execute any generic command against the server.
Description: A method to execute any arbitrary command against the a Redis server
This method is variadic and takes a dynamic number of arguments of various types (string, long, double), but must be passed at least one argument (the command keyword itself).
The return value can be various types depending on what the server itself returns. No post processing is done to the returned value and must be handled by the client code.
/* Returns: true */
$redis->rawCommand("set", "foo", "bar");
/* Returns: "bar" */
$redis->rawCommand("get", "foo");
/* Returns: 3 */
$redis->rawCommand("rpush", "mylist", "one", 2, 3.5));
/* Returns: ["one", "2", "3.5000000000000000"] */
$redis->rawCommand("lrange", "mylist", 0, -1);- multi, exec, discard - Enter and exit transactional mode
- watch, unwatch - Watches a key for modifications by another client.
Description: Enter and exit transactional mode.
(optional) Redis::MULTI or Redis::PIPELINE. Defaults to Redis::MULTI. A Redis::MULTI block of commands runs as a single transaction; a Redis::PIPELINE block is simply transmitted faster to the server, but without any guarantee of atomicity. discard cancels a transaction.
multi() returns the Redis instance and enters multi-mode. Once in multi-mode, all subsequent method calls return the same object until exec() is called.
$ret = $redis->multi()
->set('key1', 'val1')
->get('key1')
->set('key2', 'val2')
->get('key2')
->exec();
/*
$ret == Array(0 => TRUE, 1 => 'val1', 2 => TRUE, 3 => 'val2');
*/Description: Watches a key for modifications by another client.
If the key is modified between WATCH and EXEC, the MULTI/EXEC transaction will fail (return FALSE). unwatch cancels all the watching of all keys by this client.
keys: string for one key or array for a list of keys
$redis->watch('x'); // or for a list of keys: $redis->watch(['x','another key']);
/* long code here during the execution of which other clients could well modify `x` */
$ret = $redis->multi()
->incr('x')
->exec();
/*
$ret = FALSE if x has been modified between the call to WATCH and the call to EXEC.
*/- eval - Evaluate a LUA script serverside
- evalSha - Evaluate a LUA script serverside, from the SHA1 hash of the script instead of the script itself
- script - Execute the Redis SCRIPT command to perform various operations on the scripting subsystem
- getLastError - The last error message (if any)
- clearLastError - Clear the last error message
- _prefix - A utility method to prefix the value with the prefix setting for phpredis
- _unserialize - A utility method to unserialize data with whatever serializer is set up
- _serialize - A utility method to serialize data with whatever serializer is set up
Description: Evaluate a LUA script serverside
script string.
args array, optional.
num_keys int, optional.
Mixed. What is returned depends on what the LUA script itself returns, which could be a scalar value (int/string), or an array. Arrays that are returned can also contain other arrays, if that's how it was set up in your LUA script. If there is an error executing the LUA script, the getLastError() function can tell you the message that came back from Redis (e.g. compile error).
$redis->eval("return 1"); // Returns an integer: 1
$redis->eval("return {1,2,3}"); // Returns [1,2,3]
$redis->del('mylist');
$redis->rpush('mylist','a');
$redis->rpush('mylist','b');
$redis->rpush('mylist','c');
// Nested response: [1,2,3,['a','b','c']];
$redis->eval("return {1,2,3,redis.call('lrange','mylist',0,-1)}");Description: Evaluate a LUA script serverside, from the SHA1 hash of the script instead of the script itself.
In order to run this command Redis will have to have already loaded the script, either by running it or via the SCRIPT LOAD command.
script_sha string. The sha1 encoded hash of the script you want to run.
args array, optional. Arguments to pass to the LUA script.
num_keys int, optional. The number of arguments that should go into the KEYS array, vs. the ARGV array when Redis spins the script
Mixed. See EVAL
$script = 'return 1';
$sha = $redis->script('load', $script);
$redis->evalSha($sha); // Returns 1Description: Execute the Redis SCRIPT command to perform various operations on the scripting subsystem.
$redis->script('load', $script);
$redis->script('flush');
$redis->script('kill');
$redis->script('exists', $script1, [$script2, $script3, ...]);- SCRIPT LOAD will return the SHA1 hash of the passed script on success, and FALSE on failure.
- SCRIPT FLUSH should always return TRUE
- SCRIPT KILL will return true if a script was able to be killed and false if not
- SCRIPT EXISTS will return an array with TRUE or FALSE for each passed script
Description: Issue the CLIENT command with various arguments.
The Redis CLIENT command can be used in four ways.
- CLIENT LIST
- CLIENT GETNAME
- CLIENT SETNAME [name]
- CLIENT KILL [ip:port]
$redis->client('list'); // Get a list of clients
$redis->client('getname'); // Get the name of the current connection
$redis->client('setname', 'somename'); // Set the name of the current connection
$redis->client('kill', <ip:port>); // Kill the process at ip:portThis will vary depending on which client command was executed.
- CLIENT LIST will return an array of arrays with client information.
- CLIENT GETNAME will return the client name or false if none has been set
- CLIENT SETNAME will return true if it can be set and false if not
- CLIENT KILL will return true if the client can be killed, and false if not
Note: phpredis will attempt to reconnect so you can actually kill your own connection but may not notice losing it!
Description: The last error message (if any)
none
A string with the last returned script based error message, or NULL if there is no error
$redis->eval('this-is-not-lua');
$err = $redis->getLastError();
// "ERR Error compiling script (new function): user_script:1: '=' expected near '-'"Description: Clear the last error message
none
BOOL TRUE
$redis->set('x', 'a');
$redis->incr('x');
$err = $redis->getLastError();
// "ERR value is not an integer or out of range"
$redis->clearLastError();
$err = $redis->getLastError();
// NULLDescription: A utility method to prefix the value with the prefix setting for phpredis.
value string. The value you wish to prefix
If a prefix is set up, the value now prefixed. If there is no prefix, the value will be returned unchanged.
$redis->setOption(Redis::OPT_PREFIX, 'my-prefix:');
$redis->_prefix('my-value'); // Will return 'my-prefix:my-value'Description: A utility method to serialize values manually.
This method allows you to serialize a value with whatever serializer is configured, manually. This can be useful for serialization/unserialization of data going in and out of EVAL commands as phpredis can't automatically do this itself. Note that if no serializer is set, phpredis will change Array values to 'Array', and Objects to 'Object'.
value: Mixed. The value to be serialized
$redis->setOption(Redis::OPT_SERIALIZER, Redis::SERIALIZER_NONE);
$redis->_serialize("foo"); // returns "foo"
$redis->_serialize([]); // Returns "Array"
$redis->_serialize(new stdClass()); // Returns "Object"
$redis->setOption(Redis::OPT_SERIALIZER, Redis::SERIALIZER_PHP);
$redis->_serialize("foo"); // Returns 's:3:"foo";'Description: A utility method to unserialize data with whatever serializer is set up.
If there is no serializer set, the value will be returned unchanged. If there is a serializer set up, and the data passed in is malformed, an exception will be thrown. This can be useful if phpredis is serializing values, and you return something from redis in a LUA script that is serialized.
value string. The value to be unserialized
$redis->setOption(Redis::OPT_SERIALIZER, Redis::SERIALIZER_PHP);
$redis->_unserialize('a:3:{i:0;i:1;i:1;i:2;i:2;i:3;}'); // Will return [1,2,3]Description: A method to determine if a phpredis object thinks it's connected to a server
None
Boolean Returns TRUE if phpredis thinks it's connected and FALSE if not
Description: Retrieve our host or unix socket that we're connected to
None
Mixed The host or unix socket we're connected to or FALSE if we're not connected
Description: Get the port we're connected to
None
Mixed Returns the port we're connected to or FALSE if we're not connected
Description: Get the database number phpredis is pointed to
None
Mixed Returns the database number (LONG) phpredis thinks it's pointing to or FALSE if we're not connected
Description: Get the (write) timeout in use for phpredis
None
Mixed The timeout (DOUBLE) specified in our connect call or FALSE if we're not connected
Description: Get the read timeout specified to phpredis or FALSE if we're not connected
None
Mixed Returns the read timeout (which can be set using setOption and Redis::OPT_READ_TIMEOUT) or FALSE if we're not connected
Description: Gets the persistent ID that phpredis is using
None
Mixed Returns the persistent id phpredis is using (which will only be set if connected with pconnect), NULL if we're not using a persistent ID, and FALSE if we're not connected
Description: Get the password used to authenticate the phpredis connection
None
Mixed Returns the password used to authenticate a phpredis session or NULL if none was used, and FALSE if we're not connected