PHP：调用没有类名的静态方法

Question

I have simllar question like here: static-method-invocation, but in PHP. Simply, I want have class like this:

static class ClassName{
   static public function methodName(){
         //blah blah blah
   }
}

and I want to call member method without name od class like this:

require_once(ClassName.php);

methodName();

Is it possible in PHP? Thanks for your answers!