Goez Dependency Injection Container

A simple dependency injection container which was inspired by Laravel Service Container.

Features

• Nested dependency injection.
• Interface binding.

TODO

• Method injection

Installation

$ composer require goez/di

Usage

Initialize

use Goez\Di\Container;
$container = Container::createInstance();

make($name[, $arguments])

Make an instance:

class App
{
    private $appName;

    public function __construct($appName = 'ThisApp')
    {
        $this->appName = $appName;
    }
    
    public function getAppName()
    {
        return $this->appName;
    }
}

$app = $container->make(App::class);
echo $app->getAppName(); // ThisApp

$app = $container->make(App::class, ['MyApp']);
echo $app->getAppName(); // MyApp

Inject object by type-hint:

class App
{
    private $auth;
    private $appName;

    public function __construct(Auth $auth, $appName = 'ThisApp')
    {
        $this->auth = $auth;
        $this->appName = $appName;
    }
}

class Auth {}

$app = $container->make(App::class);

Nested dependency injection:

class App
{
    private $auth;
    private $appName;

    public function __construct(Auth $auth, $appName = 'ThisApp')
    {
        $this->auth = $auth;
        $this->appName = $appName;
    }
}

class Auth 
{
    private $db;
    
    public function __construct(Db $db)
    {
        $this->db = $db;
    }
}

$app = $container->make(App::class);

bind($name, $className|$closure)

Binding by key:

$container->bind('db', function ($container) {
    return new Db();
});
$db = $container->make('db');

Binding by interface:

interface DbInterface {}

class Db implements DbInterface {}

$container->bind(DbInterface::class, Db::class);
$db = $container->make(DbInterface::class);

instance($name, $instance)

Bind an existed instance.

interface DbInterface {}

class Db implements DbInterface {}

$container->instance(DbInterface::class, new Db());
$db1 = $container->make(DbInterface::class);

$container->instance(DbInterface::class, new Db());
$db2 = $container->make(DbInterface::class);

assert($db1 !== $db2); // true

singleton($name, $instance|$closure)

Create singleton instance by closure.

interface DbInterface {}

class Db implements DbInterface {}

$container->singleton(DbInterface::class, function (Container $c) {
    return $c->make(Db::class);
    // Or
    return new Db();
});
$db1 = $container->make(DbInterface::class);
$db2 = $container->make(DbInterface::class);

assert($db1 === $db2);

Create singleton instance by an existed instance.

interface DbInterface {}

class Db implements DbInterface {}

$container->singleton(DbInterface::class, new Db());
$db1 = $container->make(DbInterface::class);
$db2 = $container->make(DbInterface::class);

assert($db1 === $db2);

License

MIT