<?php

class foo {
    public function test() {
        call_user_func(array('FOO', 'ABC'));
        call_user_func(array($this, 'ABC'));
        foo::XYZ();
        self::WWW();
        call_user_func('FOO::ABC');
    }
    function __call($a, $b) {
        print "__call:\n";
        var_dump($a);
    }
    static public function __callStatic($a, $b) {
        print "__callstatic:\n";
        var_dump($a);
    }
}

$x = new foo;

$x->test();

$x::A();

foo::B();

$f = 'FOO';

$f::C();

$f::$f();

foo::$f();

?>