从全局函数php 5.3.5中调用的闭包访问私有静态函数

Question

I have encountered a strange problem. I am working on a program which should work on PHP5.3 . Today, a server with PHP5.3.5 installed gave me the following error when running my program:
Fatal error: Cannot access self:: when no class scope is active on line 19

I do not have this problem on any other server with later PHP versions. But I have to find a solution nevertheless.
To make the problem easy to understand, I made the following little script. Basically I call a global function with a closure as parameter which calls a private static function.
I researched this problem and it seems Closure::bind would be the solution, but is only available for PHP5.4+. I need a solution for PHP5.3 and I am at a dead end.

<?php

function doSth($c)
{
    $c();
}

class foo
{
    private static function bar()
    {
        echo 'OK';
    }

    public static function go()
    {
        doSth(function()
        {
            self::bar();
        });
    }
}

foo::go();

Answer 1

No need to declare self... you need to call the function this way:

$this->bar() not self::bar();