利用路由表與restful url進行匹配，分發到不同的action處理，最基本的實現，只考慮路由分發功能
代碼如下: <?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) { // 是否與當前路由匹配 $params = $this->checkUrl($method, strtolower($url), strtolower($pats[1])); if ($params != null) { array_shift($params); $action = $router["action"]; // 尋找到第一個匹配的路由即執行，然後返回 return $this->invoke($action, $params); } } } echo "404 error"; // error 404 } private function invoke($action, $params) { $acts = explode("#", $action); $className = $acts[0]."Action"; $methodName = $acts[1]; $actionDir = dirname(__FILE__).DIRECTORY_SEPARATOR."action"; // 載入action文件 $classFile = $actionDir.DIRECTORY_SEPARATOR.$className.".php"; if (! file_exists($classFile)) { // 404 error echo "404 error, no action found"; return; } else { require "$classFile"; // 使用反射執行方法 $rc = new ReflectionClass($className); if (! $rc->hasMethod($methodName)) { // 404 error echo "404 error, no method found"; return; } else { $instance = $rc->newInstance(); $method = $rc->getMethod($methodName); $method->invokeArgs($instance, $params); } } } // 正則匹配檢查，並提取出參數 private function checkUrl($method, $str, $pattern) { //echo "check $str with $pattern <br>"; $ma = array(); $pattern = ltrim(rtrim($pattern, "/")); $pattern = "/".str_replace("/", "/", $pattern)."/?$/"; $pattern = str_replace(":s", "([^/]+)", $pattern); //echo "pattern $pattern<br>"; //$str = "/".$str."$/"; if (preg_match($pattern, $str, $ma) > 0) { return $ma; } return null; } } ?>
