Until last week, I had never experienced what must have been incredibly frustrating to most developers: the fact that the self keyword in PHP refers to the class it is located in, and not necessarily a class that extends it. I personally ran into this problem when trying to extend Zend_Auth. Being a singleton, the constructor in Zend_Auth is protected, and the static method Zend_Auth::getInstance() instantiates itself. The problem is, when extended, My_Auth::getInstance() still returns an instance of Zend_Auth. The solution was to duplicate the static method in my My_Auth class, which worked properly. For example:
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Monday, April 12th, 2010 @ 7:00 am |
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Categories: PHP 5, Object-Oriented Development, Zend Framework, Technology
Tags: PHP, Zend_Auth, late static binding, static, singleton pattern