Online PHP editor | output for knhjm

<?php namespace App\Com; class Test { protected static $_instance; public static function getInstance() { if(!self::$_instance) { self::$_instance = new self(); } return self::$_instance; } public function test() { return 'works'; } protected function __construct() { } } class Service { protected static $_instance; protected $_connection; protected $_case = []; public static function getInstance() { if(!self::$_instance) { self::$_instance = new self(); } return self::$_instance; } protected function __construct() { $this->_case[] = Test::getInstance(); // TODO: Establish entity to database } public function using($nsp) { foreach($this->_case as $obj) { if($nsp instanceof $obj) { return $obj::getInstance(); } } throw new \Exception("Call to $nsp did not match any libraries."); } protected function __clone() {} } echo Service::getInstance()->using('\App\Com\Test')->test();