Router.php

<?php

class Router {
    private $routes = [];

    // Register routes
    public function add($method, $route, $action) {
        $this->routes[] = [
            'method' => strtoupper($method), // GET, POST, etc.
            'route'  => $route,
            'action' => $action
        ];
    }

    // Match route and execute the action
    public function dispatch() {
        $method = $_SERVER['REQUEST_METHOD'];  // GET, POST, etc.
        $uri = $this->getUri();

        foreach ($this->routes as $route) {
            if ($method == $route['method'] && $this->matchRoute($uri, $route['route'])) {
                $this->executeAction($route['action']);
                return;
            }
        }

        // If no route matched, show a 404
        echo "404 Not Found";
    }

    // Extract the URI without the domain and query string
    private function getUri() {
        $uri = $_SERVER['REQUEST_URI'];
        $uri = parse_url($uri, PHP_URL_PATH); // Remove query string
        return trim($uri, '/');  // Remove leading/trailing slashes
    }

    // Check if the route matches the current URI
    private function matchRoute($uri, $route) {
        // Convert the route to regex (support for parameters like {id})
        $route = preg_replace('/\{([a-zA-Z0-9_]+)\}/', '(?P<$1>[^/]+)', $route);
        $route = "/^" . $route . "$/";

        return preg_match($route, '/' . $uri);
    }

    // Call the controller/action based on the route
    private function executeAction($action) {
        list($controller, $method) = explode('@', $action);
        
        // Instantiate the controller class and call the method
        if (class_exists($controller) && method_exists($controller, $method)) {
            $controllerInstance = new $controller();
            $controllerInstance->$method();
        } else {
            echo "Action not found!";
        }
    }
}
?>