$services */ protected array $services = array(); /** * A list of created instances * * @var array $instances */ protected array $instances = array(); /** * Prevents deserialization of this class to avoid callback replacement attacks. * * @param array $data The serialized data. * @return void * @throws \Exception Always throws an exception to prevent deserialization. */ public function __unserialize( array $data ): void { throw new \Exception( 'Deserialization of Container is not allowed for security reasons.' ); } /** * The method for registering a new service. * * @param string $name The name of the service. * @param callable $callback The callable that will be used to create the service. * @return void * @phpstan-template T of object * @phpstan-param class-string $name */ public function set( string $name, callable $callback ): void { $this->services[ $name ] = $callback; } /** * Method for getting a registered service. * * @param string $name The name of the service. * @return object The service instance. * @throws \Exception If the service is not found. * @phpstan-template T of object * @phpstan-param class-string $name * @phpstan-return T */ public function get( string $name ): object { // Check if the service is already instantiated. if ( isset( $this->instances[ $name ] ) ) { /** * Instance. * * @var T $instance Instance of requested service. */ $instance = $this->instances[ $name ]; return $instance; } // Check if the service is registered. if ( ! isset( $this->services[ $name ] ) ) { throw new \Exception( esc_html( "Service not found: $name" ) ); } /** * Instance. * * @var T $instance Instance of requested service. */ $instance = $this->services[ $name ]( $this ); $this->instances[ $name ] = $instance; return $instance; } }