Simple Router in PHP (Clean URLs, Controller Style)

Routing means mapping URL paths to code. Instead of: - `user.php?id=5` You can do: - `/users/5` ## Step 1: Front controller idea All requests go to `index.php`, then routing decides what to run. ## Step 2: Very simple route matching ```php <?php $path = parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH); $method = $_SERVER['REQUEST_METHOD']; if ($method === 'GET' && $path === '/') { echo "Home"; exit; } if ($method === 'GET' && preg_match('#^/users/(\d+)$#', $path, $m)) { $id = (int)$m[1]; echo "User page for id " . $id; exit; } http_response_code(404); echo "Not found"; ?> ``` ## Why this matters This is the foundation of frameworks. Once you get routing, MVC becomes much easier. > Next: Dependency Injection concept in PHP (simple and practical).