Rails is a MVC framework built on Ruby.
PHP is NOT a framework.

If you feel like comparing/extolling the virtues of RoR compared to PHP, then try to at least be logical enough to compare RoR to a MVC framework built on PHP. There are several (though none as popular as RoR at the moment). Some are trying to imitate Struts and others trying to mimic RoR.

In fact, Zend is quite aware of RoR's popularity is in the process of creating its own framework to compete: the Zend Framework.