<?php
abstract class space{
    function __construct(){}
    abstract protected function unfold();
}

abstract class shape extends space{
    private function x1() {}
    protected final function unfold(){}
}

abstract class quad extends shape{
    private function x2() {}
    function buggy(){
        $c = get_class($this);
        $a = get_class_methods(get_class($this));
        $b = get_class_methods($this);
        print($c."\n".'a:');
        print_r($a);
        print('b:');
        print_r($b);
    }
}

class square extends quad{}

$a = new square();
$a->buggy();
print_r(get_class_methods("square"));
print_r(get_class_methods($a));
?>