sminnee / silverstripe-framework

	public function extend($method, &$a1=null, &$a2=null, &$a3=null, &$a4=null, &$a5=null, &$a6=null, &$a7=null) {

		$values = array();

		if(!empty($this->beforeExtendCallbacks[$method])) {

			foreach(array_reverse($this->beforeExtendCallbacks[$method]) as $callback) {

				$value = call_user_func_array($callback, array(&$a1, &$a2, &$a3, &$a4, &$a5, &$a6, &$a7));

				if($value !== null) $values[] = $value;

			}

			$this->beforeExtendCallbacks[$method] = array();

		}

		if($this->extension_instances) foreach($this->extension_instances as $instance) {

			if(method_exists($instance, $method)) {

			}

		}

		if(!empty($this->afterExtendCallbacks[$method])) {

			foreach(array_reverse($this->afterExtendCallbacks[$method]) as $callback) {

				$value = call_user_func_array($callback, array(&$a1, &$a2, &$a3, &$a4, &$a5, &$a6, &$a7));

				if($value !== null) $values[] = $value;

			}

			$this->afterExtendCallbacks[$method] = array();

		}

		return $values;

	}