TalkPHP - OOP: prevent method X in context Y

I wanted to know if there was a way to prevent a method in a class being called unless it is called by a specific (non-inheritance chain) object. I'm borrowing from the Zend Bootstrapping pattern:

Code:

class abstract Config_Abstract(){

    public function runConfig(){

        //iterate over methods declared in child and execute each in turn

   }

}



class Config extends Config_Abstract(){

   publc function initGood(){

       //do some stuff

   }



   publc function initBad(){

      $this->runConfig(){//VERY BAD - CIRCULAR CODE

      }

   }

}



class Application(){

    public function run(){

        $Config = new Config();

        $Config->runConfig();//should only be executed by Application class

    }

}



$App = new App();

$App->run();

there are two methods I've thought of so far, but I wanted to know if Reflection or magic methods had something that could deal with this

1: use debug_backtrace() to detect the calling object
2: pass in a reference to the calling object in the configRun() argument

Can anyone offer some insight?