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To: Marcus Boerger <helly@php.net>
CC: php internals <internals@lists.php.net>
References: <20060103205728.GF26280@desario.homelinux.net>	<1852411085.20060103220656@marcus-boerger.de>	<20060103213332.GG26280@desario.homelinux.net> <1462157471.20060103225024@marcus-boerger.de>
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Subject: Re: [PHP-DEV] __call overload detection
From: mike.n@zend.com (Mike Naberezny)

Marcus Boerger wrote:
> If you need more it is up to you to provide
> the infrastructure. Remember we will not in anyway allow __call to handle
> inheritance.

Hi Marcus,

If one is determined enough, at least visibility can be faked by exception 
trace introspection.  Below demonstrates protected, replace __CLASS__ with 
get_class($this) for private.  I see very little or no real world application 
for this and the procedure is quite expensive.

<?php
class Test {
     public function __construct() {
         // demo, should echo "hello"
         echo $this->nonexistant;
     }

     public function __get($offset) {
         try {
             throw new Exception();
         } catch (Exception $e) {
             $trace = $e->getTrace();
             $caller = isset($trace[2]['class']) ? $trace[2]['class'] : null;
             if ($caller === null
                 || $caller != __CLASS__
                 && !is_subclass_of($caller, __CLASS__)) {
                     throw new Exception('Access to protected ' .__CLASS__. 
'::' .$offset. ' from context '. $caller);
             }
         }

         return 'hello';
     }
}

$t = new Test();           // hello
echo $t->nonexistant;      // exception
?>

Mike