http://blog.agel-nash.ru/2013/6/private-method.html

HiddenCaller.trait.php

<?php
trait HiddenCaller{
  public function __call($key, $params){
		try{
			if(self::_checkMethod($key)){
				self::_getMethod($this,$key,$params);
			}
		}catch(Exception $e){die($e->getMessage());}
    }
	public static function __callStatic($key, $params){
		try{
			if(self::_checkMethod($key)){
				self::_getMethod(A,$key,$params);
			}
		}catch(Exception $e){die($e->getMessage());}
    }
	private static function _checkMethod($key){
		$flag = false;
		if(method_exists(__CLASS__,$key) || method_exists(get_parent_class(),$key)){
			$flag = true;
		}else throw new Exception('unknown method '.$key);
		return $flag;
	}
	private static function _getMethod($obj,$key,$params){
		$flag = null;
		$method = new ReflectionMethod($obj,$key);
		if($method->isPrivate() || $method->isProtected()){
			$method->setAccessible(true);	//PHP 5.3.2
			if(is_string($obj) && $method->isStatic()){
				$obj = new $obj;
			}
			$flag = $method->invokeArgs($obj,$params);
			unset($obj);
        }else throw new Exception('is no private '.$key);
		return $flag;
	}
}