Zend_Controller

Zend_Controller is the heart of Zend Framework's MVC system. Zend_Controller_Front implements a "Front Controller" pattern, in which all requests are intercepted by the front controller and dispatched to individual Action Controllers based on the URL requested.Zend_Controller_Front also implements the Singleton pattern, meaning only a single instance of it may be available at any given time. The Zend_Controller system is designed to be lightweight, modular, and extensible

 The Zend_Controller workflow is implemented by several components.