gistfile1.txt

class Mock{
			
			private $context;
			
			public function __construct($a){
				$this->context = new Context($a);
			}
			
			public function __destruct(){
				Context::destroyContext($this->context);
			}
			
		}
		
		class Context {
			
			public $a;
			public static $ref = [];
			public function __construct($a){
				$this->a = $a;
				array_push(self::$ref, $this);
			}
			
			public function destroyContext($context){
				self::$ref = array_filter(self::$ref, function($ref) use ($context){ return $context !== $ref;});
			}
			
			public static function getCurrentContext(){
				return end(self::$ref);
			}
		}
		
		function x($i){
			$a = new Mock($i);
			var_dump(Context::getCurrentContext());
			if($i < 100){
				x($i + 1);
			}
			var_dump(Context::getCurrentContext());
		}
		
		x(1);