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HTML中的任何元素都要亲自实践,只有明白了什么元素会起到什么效果之后,你才会记忆深刻,而一味的啃书,绝对是不行的,我想大部分新手之所以觉得概念难学,大部分是一个字“懒”,懒是阻止进步的最大敌人,所以克服掉懒的习惯,才能更快的学好一样东西。
我前次在讲redirect和forward的时分我就说过,这两个函数要正常利用还需求修正一下Route这个类,最少要将好比域名,掌握器名,Action名等存储起来,前面挪用redirect,forward的时分可使用。
如今咱们就转到Route.php,本来这个类的代码很复杂:
01 <?php 02 class Route extends Base { 03 public static function run() { 04 $controller= empty($_GET['c']) ? C('defaultController') : trim($_GET['c']); //设置了默许的掌握器 05 $action = empty($_GET['a']) ? C('defaultAction') : trim($_GET['a']); //设置了默许的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 }
如今咱们需求将域名掏出来,那怎样弄呢?
实践上PHP有一个壮大的超全局变量$_SERVER,良多信息都存储在这外面,咱们可以检查一下:
1 <?php 2 var_dump($_SERVER); 咱们注重到这外面有一个 HTTP_HOST属性,检查PHP手册,这么写的:
Contents of the Host: header from the current request, if there is one. 假定如今有一个URL:http://localhost/test/test.php,那$_SERVER['HTTP_HOST']的值为何呢,实践上为localhost。普通来讲,咱们想取到的是localhost/test,那末怎样获得前面的/test呢?
咱们持续搜刮一下:
发明REQUEST_URI,SCRIPT_FILENAME,SCRIPT_NAME,PHP_SELF的值都为/test/test.php,查询PHP手册注释分离为:
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.
咱们发明REQUEST_URI对照靠谱,固然,我这个中央测试的是apache的情形,nginx,iis等还有在.htaccess文件设置了rewrite划定规矩后又纷歧样,假如真要写一个好的Route,思索的器材会十分多的,针关于URL的通俗形式,PATHINFO形式,REWRITE形式,兼容形式,咱们利用最通俗的体例。
起首咱们界说一个存储途径的类,Path.php:
01 <?php 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,这个类只要setter和getter,我就不多讲了。
然后再看看Route.php,起首仍是获得URL,怎样获得呢?
1 $_SERVER['HTTP_HOST'] . substr($_SERVER['REQUEST_URI'],0,strrpos($_SERVER['REQUEST_URI'],'/')) 因为之前已讲了HTTP_HOST和REQUEST_URI的感化了,这段代码次要就说一下前面的substr和strrpos,substr就是截断字符串,strrpos是获得某一个子字符串在父字符串中最初一次呈现的地位。
PS:我如许写得仍是有成绩的,然而为了简捷,不弄庞杂了。
然后就是将这些值存储到Path中,
1 Path::setBasePath($_SERVER['HTTP_HOST'] . substr($_SERVER['REQUEST_URI'],0,strrpos($_SERVER['REQUEST_URI'],'/'))); 2 Path::setController($controller); 3 Path::setAction($action); 设置了这些参数以后,在Controller.php中的redirect和forward的代码也要稍做修正:
01 <?php 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 //工夫无限,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 //工夫无限,不写了 38 } 39 } else { 40 //工夫无限,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 . $str . '.php'); 55 } 56 } 57 } 这个外面次要的修改就是掌握器和Action的获得酿成了挪用Path类的办法,还有_redirect中,$str = 'http://' . Path::getBasePath() . '/index.php?',这里我假定利用的时http协定,而且不存在rewrite,办事器采取的是apache。
弄定以后再利用_redirect和_forward,发明是否是没有成绩了?
也许您在学习PHP的时候只想尽快的开发一个网站,也就会想我做网站,干嘛要学什么网页这些小儿科?不难看出,眼高手低的新手不在少数,这种思想无疑于建造空中楼阁,你不建地基,何来的房顶呢? |
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