利用路由表与restful url进行匹配，分发到不同的action处理，最基本的实现，只考虑路由分发功能
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, $params);
}
}
}
echo "404 error";
// error 404
}
private function invoke($action, $params) {
$acts = explode("#", $action);
$className = $acts[0]."Action";
$methodName = $acts[1];
$actionDir = dirname(__FILE__).DIRECTORY_SEPARATOR."action";
// 载入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";
// 使用反射执行方法
$rc = new ReflectionClass($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, $params);
}
}
}
// 正则匹配检查，并提取出参数
private function checkUrl($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;
}
}
?>
