PHP Router Class v.0.2

<?php

class Router {
    public $defaultRoute;
    protected $_url, $_routes = array();

    public function __construct($url) {
        $this->_url = $url;
    }

    public function add($method, $rule, $func) {
        array_push($this->_routes, $method, $rule, $func);
    }

    public function get($rule, $func) {
        array_push($this->_routes, 'GET', $rule, $func);
    }

    public function post($rule, $func) {
        array_push($this->_routes, 'POST', $rule, $func);
    }

    public function put($rule, $func) {
        array_push($this->_routes, 'PUT', $rule, $func);
    }

    public function delete($rule, $func) {
        array_push($this->_routes, 'DELETE', $rule, $func);
    }

    public function process() {
        $n = count($this->_routes);
        for ($i = 0; $i < $n; $i += 3) {
            $method = $this->_routes[$i];
            if (strtoupper($method) == $_SERVER['REQUEST_METHOD']) {
                $rule = $this->_routes[$i + 1];
                $func = $this->_routes[$i + 2];
                @$is_regexp = preg_match($rule, '') !== false;
                if ($is_regexp) {
                    if (preg_match($rule, $this->_url, $matches)) {
                        return call_user_func_array($func, array_slice($matches, 1));
                    }
                }
                else if ($rule == $this->_url) {
                    return call_user_func($func);
                }
            }
        }
        if ($this->defaultRoute) {
            $func = $this->defaultRoute;
            call_user_func($func);
        }
    }
}

?>