gistfile1.txt

<?
 
class a {
    protected $foo;

    public function showFoo() {
    	echo $this->foo;
    }
}
 
class b extends a {
    public function test() {
        $a = new a();
        $a->foo = "bar";
        var_dump($a);
        $a->showFoo();
    }
}
 
$b = new b();
$b->test();