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<?php class Container// implements \ArrayAccess { protected $values; public function __construct (array $values = array()) { $this->values = $values; } /* ... */ } class ServiceContainer extends Container { protected static $instance; protected $storage; protected function __construct($storage) { $this->storage = $storage; } public static function init(ServiceStorageInterface $storage) { return static::$instance = new static($storage); } public static function getInstance() { if ( ! isset(static::$instance)) { throw new Exception('ServiceContainer is not initialized'); } return static::$instance; } }