我上次在讲redirect和forward的时候我就说过，这两个函数要正常使用还需要修改一下Route这个类，至少要将比如域名，控制器名，Action名等存储起来，后面调用redirect,forward的时候可以使用。
现在我们就转到Route.php，原来这个类的代码很简单：
| 01 |
| 02 | class Route extends Base { |
| 03 | public static function run() { |
| 04 | $controller= empty($_GET['c']) ? C('defaultController') : trim($_GET['c']); //设置了默认的控制器 |
| 05 | $action = empty($_GET['a']) ? C('defaultAction') : trim($_GET['a']); //设置了默认的Action |
| 06 | $controllerBasePath = APP_PATH . '/UserApps/Modules/Controllers/'; |
| 07 | $controllerFilePath = $controllerBasePath . $controller . 'Controller.php'; |
| 08 | if(is_file($controllerFilePath)) { |
| 09 | include $controllerFilePath; |
| 10 | $controllerName = $controller . 'Controller'; |
| 11 | if(class_exists($controllerName)) { |
| 12 | $controllerHandler = new $controllerName(); |
| 13 | if(method_exists($controllerHandler,$action)) { |
| 14 | $controllerHandler->$action(); |
| 15 | } else { |
| 16 | echo 'the method does not exists'; |
| 17 | } |
| 18 | } else { |
| 19 | echo 'the class does not exists'; |
| 20 | } |
| 21 | } else { |
| 22 | echo 'controller not exists'; |
| 23 | } |
| 24 | } |
| 25 | } |
现在我们需要将域名取出来，那怎么弄呢？
实际上PHP有一个强大的超全局变量$_SERVER，很多信息都存储在这里面，我们可以查看一下：
| 1 |
| 2 | var_dump($_SERVER); |
我们注意到这里面有一个 HTTP_HOST属性，查看PHP手册，这么写的：
Contents of the Host: header from the current request, if there is one.
假设现在有一个URL:http://localhost/test/test.php，那$_SERVER['HTTP_HOST']的值为什么呢,实际上为localhost。一般来说，我们想取到的是localhost/test，那么怎么获取后面的/test呢？
我们继续搜索一下：
发现REQUEST_URI，SCRIPT_FILENAME，SCRIPT_NAME，PHP_SELF的值都为/test/test.php，查询PHP手册解释分别为：
1. The URI which was given in order to access this page; for instance, '/index.html'
2. The absolute pathname of the currently executing script.
3.Contains the current script's path. This is useful for pages which need to point to themselves. The __FILE__ constant contains the full path and filename of the current (i.e. included) file.
4. The filename of the currently executing script, relative to the document root. For instance, $_SERVER['PHP_SELF'] in a script at the address http://example.com/test.php/foo.bar would be /test.php/foo.bar. The __FILE__ constant contains the full path and filename of the current (i.e. included) file. If PHP is running as a command-line processor this variable contains the script name since PHP 4.3.0. Previously it was not available.
我们发现REQUEST_URI比较靠谱，当然，我这个地方测试的是apache的情况，nginx，iis等还有在.htaccess文件设置了rewrite规则后又不一样，如果真要写一个好的Route，考虑的东西会非常多的，针对于URL的普通模式，PATHINFO模式，REWRITE模式，兼容模式，我们使用最普通的方式。
首先我们定义一个存储路径的类，Path.php：
| 01 |
| 02 | class Path extends Base { |
| 03 | private static $_base = ''; |
| 04 | private static $_controller = ''; |
| 05 | private static $_action = ''; |
| 06 | public static function setBasePath($base) { |
| 07 | self::$_base = $base; |
| 08 | } |
| 09 | public static function setController($controller) { |
| 10 | self::$_controller = $controller; |
| 11 | } |
| 12 | public static function setAction($action) { |
| 13 | self::$_action = $action; |
| 14 | } |
| 15 | public static function getBasePath() { |
| 16 | return self::$_base; |
| 17 | } |
| 18 | public static function getController() { |
| 19 | return self::$_controller; |
| 20 | } |
| 21 | public static function getAction() { |
| 22 | return self::$_action; |
| 23 | } |
| 24 | } |
就像Java中pojo，这个类只有setter和getter，我就不多讲了。
然后再看看Route.php，首先还是获取URL，怎么获取呢？
| 1 | $_SERVER['HTTP_HOST'] . substr($_SERVER['REQUEST_URI'],0,strrpos($_SERVER['REQUEST_URI'],'/')) |
由于之前已经讲了HTTP_HOST和REQUEST_URI的作用了，这段代码主要就说一下后面的substr和strrpos，substr就是截断字符串，strrpos是获取某一个子字符串在父字符串中最后一次出现的位置。
PS：我这样写得还是有问题的，但是为了简便，不弄复杂了。
然后就是将这些值存储到Path中，
| 1 | Path::setBasePath($_SERVER['HTTP_HOST'] . substr($_SERVER['REQUEST_URI'],0,strrpos($_SERVER['REQUEST_URI'],'/'))); |
| 2 | Path::setController($controller); |
| 3 | Path::setAction($action); |
设置了这些参数之后，在Controller.php中的redirect和forward的代码也要稍做修改：
| 01 |
| 02 | class Controller extends Base { |
| 03 | protected function _redirect(Array $arr) { |
| 04 | array_key_exists('controller',$arr) $arr['controller'] = Path::getContrller(); |
| 05 | array_key_exists('action',$arr) $arr['action'] = Path::getAction();; |
| 06 | $str = 'http://' . Path::getBasePath() . '/index.php?'; |
| 07 | foreach($arr as $key => $val) { |
| 08 | if(!is_int($key)) { |
| 09 | $str .= ($key . '=' . $val . '&'); |
| 10 | } |
| 11 | } |
| 12 | $str = substr($str,0,strlen($str) - 1); |
| 13 | Response::redirect($str); |
| 14 | } |
| 15 | protected function _forward(Array $arr) { |
| 16 | $controller = Path::getController(); |
| 17 | $action = Path::getAction(); |
| 18 | if(array_key_exists('controller',$arr)) { |
| 19 | $controller = $arr['controller']; |
| 20 | } |
| 21 | if(array_key_exists('action',$arr)) { |
| 22 | $action = $arr['action']; |
| 23 | } |
| 24 | $controller .= 'Controller'; |
| 25 | if($controller === get_class()) { |
| 26 | if(method_exists($this,$action)) { |
| 27 | $this->$action(); |
| 28 | } else { |
| 29 | //时间有限，不写逻辑了 |
| 30 | } |
| 31 | } else { |
| 32 | if(class_exists($controller)) { |
| 33 | $class = new $controller(); |
| 34 | if(method_exists($class,$action)) { |
| 35 | $class->$action(); |
| 36 | } else { |
| 37 | //时间有限，不写了 |
| 38 | } |
| 39 | } else { |
| 40 | //时间有限，不写了 |
| 41 | } |
| 42 | } |
| 43 | } |
| 44 | protected function _assign(Array $arr) { |
| 45 | View::assign($arr); |
| 46 | } |
| 47 | protected function _display($str) { |
| 48 | if(is_string($str)) { |
| 49 | $str = str_replace(array( |
| 50 | '.','#' |
| 51 | ),array( |
| 52 | '/','.' |
| 53 | ),$str); |
| 54 | View::display(MODULES_PATH . View::VIEW_BASE_PATH . $str . '.php'); |
| 55 | } |
| 56 | } |
| 57 | } |
这个里面主要的改动就是控制器和Action的获取变成了调用Path类的方法，还有_redirect中，$str = 'http://' . Path::getBasePath() . '/index.php?',这里我假设使用的时http协议，并且不存在rewrite，服务器采用的是apache。
搞定之后再使用_redirect和_forward，发现是不是没有问题了？
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