class A {
    function hi(){ echo 'hi'; }
    function __destruct(){
        echo 'destroy';
    }
}
class B{
    public $this_ = '';
    function __construct(){
        $this->this_ = new A;
    }
    function __call($method,$params) {
          return call_user_func_array(array($this->this_,$method),$params);
    }
}

$b = new B;
$b->__destruct();

输出：

destroydestroy

编辑

zneak和TomcatExodus都是正确的.如果我只是：

[..code..]
$b = new B;
$b->__destruct();
PRint 'end of script';

输出将显示：

destroyend of scriptdestroy