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PHP: Form & Session & Cookies

Set B

Please answer the following 50 multiple-choice questions to test your knowledge in Form & Session & Cookies. You must place your answer file in the submission folder. Within the submission/Q6/set_b folder, create a folder called your github_id.

Which superglobal variable is used to retrieve data from a form submitted using the POST method?
- a) $_POST
- b) $_GET
- c) $_REQUEST
- d) $_SERVER
How can you check if a form has been submitted in PHP?
- a) By checking if $_POST or $_GET is not empty
- b) By checking if $_SERVER['REQUEST_METHOD'] is equal to 'POST'
- c) By checking if $_REQUEST contains form data
- d) By checking if $_COOKIE is set
Which function is used to start a session in PHP?
- a) session_start()
- b) session_open()
- c) session_init()
- d) session_begin()
How can you set a session variable in PHP?
- a) By assigning a value to $_SESSION['variable']
- b) By using the set_session() function
- c) By using the session_set() function
- d) By assigning a value to $_COOKIE['variable']
What is the purpose of the session_destroy() function in PHP?
- a) To destroy all session data
- b) To remove a specific session variable
- c) To close the session and write session data
- d) To regenerate the session ID
How can you retrieve the value of a session variable in PHP?
- a) By accessing $_SESSION['variable']
- b) By using the get_session() function
- c) By accessing $_COOKIE['variable']
- d) By using the retrieve_session() function
Which function is used to set a cookie in PHP?
- a) setcookie()
- b) create_cookie()
- c) store_cookie()
- d) cookie_set()
How can you retrieve the value of a cookie in PHP?
- a) By accessing $_COOKIE['cookieName']
- b) By using the get_cookie() function
- c) By accessing $_SESSION['cookieName']
- d) By using the retrieve_cookie() function
How can you delete a cookie in PHP?
- a) By setting the cookie with an empty value and an expired timestamp
- b) By using the delete_cookie() function
- c) By accessing $_COOKIE['cookieName'] and assigning it a null value
- d) By using the unset_cookie() function
What is the purpose of the htmlspecialchars() function in PHP when working with form input?
- a) To convert special characters to HTML entities
- b) To validate form input against a specified pattern
- c) To sanitize form input and prevent SQL injection
- d) To encode form input in Base64 format
Which PHP function is used to check if a session variable is set?
- a) isset()
- b) empty()
- c) session_isset()
- d) session_exists()
How can you prevent cross-site scripting (XSS) attacks when displaying user input on a webpage?
- a) By using htmlspecialchars() to encode the output
- b) By using strip_tags() to remove HTML tags
- c) By using preg_match() to validate the input
- d) By using urlencode() to encode the output
Which PHP function is used to check if a cookie is set?
- a) isset()
- b) empty()
- c) cookie_isset()
- d) cookie_exists()
How can you restrict the lifetime of a cookie in PHP?
- a) By setting the cookie with an expiration timestamp in the future
- b) By setting the cookie with an expiration timestamp in the past
- c) By using the setcookie_lifetime() function
- d) By using the cookie_set_lifetime() function
What is the purpose of the session_regenerate_id() function in PHP?
- a) To regenerate the session ID to prevent session fixation attacks
- b) To retrieve the current session ID
- c) To destroy the current session and start a new one
- d) To update the session data with a new ID
How can you store an array in a session variable in PHP?
- a) By assigning the array to $_SESSION['variable']
- b) By using the serialize() function before assigning the array
- c) By using the json_encode() function before assigning the array
- d) By converting the array to a string using implode() before assigning it
Which PHP function is used to check if a form input field is empty?
- a) empty()
- b) isset()
- c) is_null()
- d) is_empty()
How can you retrieve the value of a selected option from a dropdown menu in PHP?
- a) By accessing $_POST['fieldname']
- b) By using the get_option() function
- c) By accessing $_REQUEST['fieldname']
- d) By using the retrieve_option() function
What is the purpose of the session_write_close() function in PHP?
- a) To close the session and write session data
- b) To destroy all session data
- c) To start a new session
- d) To regenerate the session ID
How can you prevent session fixation attacks in PHP?
- a) By regenerating the session ID after successful login
- b) By using HTTPS for secure session communication
- c) By validating session data against a predefined pattern
- d) By encrypting session data using a secret key
Which PHP function is used to retrieve the current session ID?
- a) session_id()
- b) session_get_id()
- c) session_current_id()
- d) session_retrieve_id()
How can you destroy a specific session variable in PHP?
- a) By using the unset() function on $_SESSION['variable']
- b) By using the destroy_session_variable() function
- c) By setting $_SESSION['variable'] to null
- d) By using the remove_session_variable() function
What is the purpose of the session_unset() function in PHP?
- a) To remove all session variables
- b) To remove a specific session variable
- c) To close the session and write session data
- d) To regenerate the session ID
How can you set a cookie with an expiration date in the past to delete it in PHP?
- a) By setting the cookie with an expiration timestamp in the past
- b) By using the delete_cookie() function
- c) By accessing $_COOKIE['cookieName'] and assigning it a null value
- d) By using the unset_cookie() function
What is the purpose of the session_id() function in PHP?
- a) To retrieve the current session ID
- b) To generate a new session ID
- c) To validate a session ID against a predefined pattern
- d) To update the session data with a new ID
How can you check if a session variable is empty in PHP?
- a) By using empty($_SESSION['variable'])
- b) By using isset($_SESSION['variable'])
- c) By using is_null($_SESSION['variable'])
- d) By using $_SESSION['variable'] == ''
Which PHP function is used to set a session timeout?
- a) session_set_timeout()
- b) session_timeout()
- c) set_session_timeout()
- d) ini_set('session.gc_maxlifetime')
How can you check if a cookie is empty in PHP?
- a) By using empty($_COOKIE['cookieName'])
- b) By using isset($_COOKIE['cookieName'])
- c) By using is_null($_COOKIE['cookieName'])
- d) By using $_COOKIE['cookieName'] == ''
What is the purpose of the urlencode() function in PHP?
- a) To encode a string for safe use in a URL
- b) To convert special characters to HTML entities
- c) To sanitize form input and prevent SQL injection
- d) To encrypt a string using a secret key
How can you retrieve the number of items in a session array in PHP?
- a) By using the count() function on $_SESSION['array']
- b) By using the sizeof() function on $_SESSION['array']
- c) By accessing $_SESSION['array']['length']
- d) By using the get_array_length() function
Which PHP function is used to check if a session is active?
- a) session_is_active()
- b) session_status()
- c) session_active()
- d) session_check()
How can you check if a checkbox is checked in PHP?
- a) By using isset($_POST['checkboxName'])
- b) By using empty($_POST['checkboxName'])
- c) By using $_POST['checkboxName'] == 'checked'
- d) By using is_null($_POST['checkboxName'])
What is the purpose of the session_commit() function in PHP?
- a) To close the session and write session data
- b) To destroy all session data
- c) To start a new session
- d) To regenerate the session ID
How can you store multiple values in a single cookie in PHP?
- a) By serializing an array and assigning it to the cookie value
- b) By using setcookie() multiple times with different cookie names
- c) By concatenating the values and assigning them to the cookie value
- d) By using the set_cookie_array() function
Which PHP function is used to check if a session has been started?
- a) session_is_started()
- b) session_status()
- c) session_started()
- d) session_check_started()
How can you prevent session hijacking in PHP?
- a) By using a secure session ID generated with a secret key
- b) By encrypting session data using a private key
- c) By validating session data against a predefined pattern
- d) By using CSRF tokens for form submissions
How can you check if a session is empty in PHP?
- a) By using empty($_SESSION)
- b) By using isset($_SESSION)
- c) By using is_null($_SESSION)
- d) By using $_SESSION == ''
What is the purpose of the session_abort() function in PHP?
- a) To discard session changes and close the session
- b) To destroy all session data
- c) To regenerate the session ID
- d) To update the session data with a new ID
How can you restrict the access to a specific page to only logged-in users in PHP?
- a) By checking if a session variable representing the user's login status is set
- b) By using the authenticate_user() function
- c) By validating the user's credentials against a database
- d) By encrypting the page content with a private key
Which PHP function is used to check if a cookie domain is secure?
- a) is_cookie_secure()
- b) cookie_domain_secure()
- c) cookie_is_secure()
- d) $_COOKIE['secure']
How can you prevent session data from being accessible by JavaScript in PHP?
- a) By setting the HttpOnly flag when setting session cookies
- b) By using JavaScript to encrypt the session data
- c) By validating session data against a predefined pattern
- d) By using AJAX to retrieve session data asynchronously
What is the purpose of the session_gc() function in PHP?
- a) To perform garbage collection on expired session data
- b) To retrieve the current session ID
- c) To destroy the current session and start a new one
- d) To update the session data with a new ID
How can you set a session timeout in PHP?
- a) By modifying the session.gc_maxlifetime configuration directive
- b) By using the set_session_timeout() function
- c) By setting $_SESSION['timeout'] to a specific value
- d) By using the session_set_timeout() function
Which PHP function is used to retrieve the value of a cookie?
- a) $_COOKIE['cookieName']
- b) retrieve_cookie('cookieName')
- c) get_cookie_value('cookieName')
- d) cookie_value('cookieName')
How can you restrict the access to a specific page to only users with admin privileges in PHP?
- a) By checking if a session variable representing the user's admin status is set to true
- b) By using the validate_admin_user() function
- c) By validating the user's credentials against an admin database
- d) By encrypting the page content with an admin key
What is the purpose of the session_destroy() function in PHP?
- a) To destroy all session data
- b) To remove a specific session variable
- c) To close the session and write session data
- d) To regenerate the session ID
How can you retrieve the value of a specific cookie in PHP?
- a) By accessing $_COOKIE['cookieName']
- b) By using the get_cookie_value('cookieName') function
- c) By using retrieve_cookie('cookieName')
- d) By using the cookie_value('cookieName') function
Which PHP function is used to set the domain for a cookie?
- a) set_cookie_domain()
- b) cookie_set_domain()
- c) cookie_domain()
- d) setcookie() function with the domain parameter
How can you prevent session fixation attacks in PHP?
- a) By regenerating the session ID after successful login
- b) By using HTTP-only cookies for session management
- c) By validating session data against a predefined pattern
- d) By using CSRF tokens for form submissions
What is the purpose of the session_save_path() function in PHP?
- a) To retrieve the current session save path
- b) To set the save path for session files
- c) To destroy the current session and start a new one
- d) To update the session data with a new ID

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