php处理restful请求的路由类分享

代码如下:
<?php
    class Router {
        // 路由表
        private $routers = array(
            array("name"=>"userlist", "pattern"=>"get /user", "action"=>"User#get"),
            array("name"=>"userinfo", "pattern"=>"get /user/:s", "action"=>"User#getById"),
            array("name"=>"useradd", "pattern"=>"post /user", "action"=>"User#add"),
            array("name"=>"userupdate", "pattern"=>"update /user", "action"=>"User#update"),
            array("name"=>"userdel", "pattern"=>"delete /user/:id", "action"=>"User#delete")
        );

        // 入口
        public function dispatch() {
            $url = $_SERVER["REQUEST_URI"];
            $method = $_SERVER["REQUEST_METHOD"];

            foreach ($this->routers as $router) {
                $pattern = $router["pattern"];
                $pats = explode(" ", $pattern);
                if (strcasecmp($pats[0], $method) == 0) {
                    // 是否与当前路由匹配
                    $params = $this->checkUrl($method, strtolower($url), strtolower($pats[1]));
                    if ($params != null) {
                        array_shift($params);
                        $action = $router["action"];
                        // 寻找到第一个匹配的路由即执行，然后返回
                        return $this->invoke($action, $params);