<?php
class A {
    function __construct() {
        debug_print_backtrace();
        $bt = debug_backtrace();
        foreach ($bt as $t) {
            print $t['class'].$t['type'].$t['function']."\n";
        }
    }

    function foo() {
        debug_print_backtrace();
        $bt = debug_backtrace();
        foreach ($bt as $t) {
                        print $t['class'].$t['type'].$t['function']."\n";
        }
    }

    static function bar() {
        debug_print_backtrace();
        $bt = debug_backtrace();
        foreach ($bt as $t) {
            print $t['class'].$t['type'].$t['function']."\n";
        }
    }
}

class B extends A {
    function __construct() {
        parent::__construct();
    }

    function foo() {
        parent::foo();
    }

    static function bar() {
        parent::bar();
    }
}

$b = new B();
$b->foo();
B::bar();
?>