private method access for php using Reflection

gistfile1.php

<?php

class Ex1 {
    private function private_method($val1 , $val2) {
        return func_get_args();
    }
}

$obj = new Ex1();
$r = call_private_method($obj, 'private_method', 'test1', 'test2');
var_dump($r);

function call_private_method($obj, $method_name)
{
    $args = array_slice(func_get_args(), 2);
    array_unshift($args, $obj);
    $ref_obj = new ReflectionObject($obj);
    $ref_method = $ref_obj->getMethod($method_name);
    $ref_method->setAccessible(true);
    return call_user_func_array(array($ref_method, 'invoke'), $args);
}