<?php interface Request{ public function getUri(); } class MyRequest implements Request { public function getUri() { return $_SERVER[REQUEST_URI]; // don't say a word } } class Router { protected Request $request; public function setRequest(Request $request) { $this->request = $request; } public function route() { $this->request->getUri(); // ... // return stuff; } public function route() { $this->request->getUri(); // ... // return stuff; } } // Will blow up here if checked after constructor $router = new Router; if (/*some coditional not always true*/) { $router->setRequest($request); } // Will blow up here otherwise $route->route()
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