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copied!<p>Zend will first send all your requests to FrontController which is available at Zend/Controller/Front.php. FrontController will inject the Http request into the controller here is the code where it is happening</p> <pre><code> /** * Instantiate default request object (HTTP version) if none provided */ if (null !== $request) { $this->setRequest($request); } elseif ((null === $request) && (null === ($request = $this->getRequest()))) { require_once 'Zend/Controller/Request/Http.php'; $request = new Zend_Controller_Request_Http(); $this->setRequest($request); } </code></pre> <blockquote> <p>The purpose of frontcontroller is to <strong>initialize the request environment</strong>, route the incoming request, and then dispatch any discovered actions; it aggregates any responses and returns them when the process is complete.</p> </blockquote> <p>More about the FrontController <a href="http://framework.zend.com/manual/en/zend.controller.front.html" rel="nofollow">here</a></p> <p>To further answer your query </p> <pre><code>/** * Return the Request object * * @return Zend_Controller_Request_Abstract */ public function getRequest() { return $this->_request; } </code></pre> <p>this is what you will in Zend/Controller/Action.php - here comment says Zend_Controller_Request_Abstract '<strong>is-a</strong>' return type. I highlighted 'is-a' because it can return any class which 'is-a' Zend_Controller_Request_Abstract. To more about is-a check this <a href="http://en.wikipedia.org/wiki/Is-a" rel="nofollow">wikipedia</a> page</p> <blockquote> <p>"In knowledge representation, object-oriented programming and design, is-a or is_a or is a (subsumption) is a relationship where one class D is a subclass of another class B (and so B is a superclass of D)."</p> </blockquote>

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