__callStatic is not called . Can help me to call static please

class m
{
  public static function __callStatic($name, $arguments)
  {
      echo "Calling static method '$name' "
           . implode(', ', $arguments). "\n";
  }
}

class MethodTest extends m
{
    public function __call($name, $arguments)
    {
        echo "Calling object method '$name' "
             . implode(', ', $arguments). "\n";
    }
}

class MethodTest2 extends m
{
    public function index()
    {
      MethodTest::test();
    }


}
call_user_func(['MethodTest2','index']);

Strict Standards: call_user_func() expects parameter 1 to be a valid callback, non-static method MethodTest2::index() should not be called statically in /var/www/html/api/index.php on line 45 Calling static method 'test'