【thinkphp3.x】ThinkPHP/Lib/Core/Dispatcher.class.php文件分析

<?php// +----------------------------------------------------------------------// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]// +----------------------------------------------------------------------// | Copyright (c) 2006-2012 http://thinkphp.cn All rights reserved.// +----------------------------------------------------------------------// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )// +----------------------------------------------------------------------// | Author: liu21st <[e-mail]>// +----------------------------------------------------------------------/** * ThinkPHP内置的Dispatcher类 * 完成URL解析、路由和调度 * @category   Think * @package  Think * @subpackage  Core * @author    liu21st <[e-mail]> */class Dispatcher {    /**     * URL映射到控制器     * @access public     * @return void     */    static public function dispatch() {        $urlMode  =  C('URL_MODEL');//默认值为1-(PATHINFO 模式)        //C('VAR_PATHINFO')-默认情况下是有值的 ; $_GET[C('VAR_PATHINFO')])-如果没有以get传参的话，就获取不到值了        if(!empty($_GET[C('VAR_PATHINFO')])) { // 判断URL里面是否有兼容模式参数        //'VAR_PATHINFO'=> 's',// PATHINFO 兼容模式获取变量例如 ?s=/module/action/id/1 后面的参数取决于URL_PATHINFO_DEPR            $_SERVER['PATH_INFO']   = $_GET[C('VAR_PATHINFO')];            unset($_GET[C('VAR_PATHINFO')]);        }                if($urlMode == URL_COMPAT ){//兼容模式的情况            // 兼容模式判断            define('PHP_FILE',_PHP_FILE_.'?'.C('VAR_PATHINFO').'=');        }elseif($urlMode == URL_REWRITE ) {//重写模式的情况            //当前项目地址            $url    =   dirname(_PHP_FILE_);            if($url == '/' || $url == '\\')                $url    =   '';            define('PHP_FILE',$url);        }else {//默认执行            //当前项目地址,"/index.php"            define('PHP_FILE',_PHP_FILE_);        }        // 开启子域名部署        if(C('APP_SUB_DOMAIN_DEPLOY')) {//是否开启子域名部署，默认值为false            $rules      = C('APP_SUB_DOMAIN_RULES');            $subDomain  = strtolower(substr($_SERVER['HTTP_HOST'],0,strpos($_SERVER['HTTP_HOST'],'.')));            define('SUB_DOMAIN',$subDomain); // 二级域名定义            if($subDomain && isset($rules[$subDomain])) {                $rule =  $rules[$subDomain];            }elseif(isset($rules['*'])){ // 泛域名支持                if('www' != $subDomain && !in_array($subDomain,C('APP_SUB_DOMAIN_DENY'))) {                    $rule =  $rules['*'];                }            }            if(!empty($rule)) {                // 子域名部署规则 '子域名'=>array('分组名/[模块名]','var1=a&var2=b');                $array  =   explode('/',$rule[0]);                $module =   array_pop($array);                if(!empty($module)) {                    $_GET[C('VAR_MODULE')]  =   $module;                    $domainModule           =   true;                }                if(!empty($array)) {                    $_GET[C('VAR_GROUP')]   =   array_pop($array);                    $domainGroup            =   true;                }                if(isset($rule[1])) { // 传入参数                    parse_str($rule[1],$parms);                    $_GET   =  array_merge($_GET,$parms);                }            }        }                // 分析PATHINFO信息        if(empty($_SERVER['PATH_INFO'])) {//默认为空，在有兼容模式参数时才不会为空        //ORIG_PATH_INFO,REDIRECT_PATH_INFO,REDIRECT_URL            $types   =  explode(',',C('URL_PATHINFO_FETCH'));            foreach ($types as $type){            //strpos($type,':')-如果找不到，则返回布尔值                if(0===strpos($type,':')) {// 支持函数判断                    $_SERVER['PATH_INFO'] =   call_user_func(substr($type,1));                    break;                }elseif(!empty($_SERVER[$type])) {                    $_SERVER['PATH_INFO'] = (0 === strpos($_SERVER[$type],$_SERVER['SCRIPT_NAME']))?                        substr($_SERVER[$type], strlen($_SERVER['SCRIPT_NAME']))   :  $_SERVER[$type];                    break;                }            }        }                $depr = C('URL_PATHINFO_DEPR');//PATHINFO模式下，各参数之间的分割符号                if(!empty($_SERVER['PATH_INFO'])) {//默认不执行            tag('path_info');            $part =  pathinfo($_SERVER['PATH_INFO']);            define('__EXT__', isset($part['extension'])?strtolower($part['extension']):'');            if(C('URL_HTML_SUFFIX')) {                $_SERVER['PATH_INFO'] = preg_replace('/\.('.trim(C('URL_HTML_SUFFIX'),'.').')$/i', '', $_SERVER['PATH_INFO']);            }elseif(__EXT__) {                $_SERVER['PATH_INFO'] = preg_replace('/.'.__EXT__.'$/i','',$_SERVER['PATH_INFO']);            }            if(!self::routerCheck()){   // 检测路由规则 如果没有则按默认规则调度URL                $paths = explode($depr,trim($_SERVER['PATH_INFO'],'/'));                if(C('VAR_URL_PARAMS')) {                    // 直接通过$_GET['_URL_'][1] $_GET['_URL_'][2] 获取URL参数 方便不用路由时参数获取                    $_GET[C('VAR_URL_PARAMS')]   =  $paths;                }                $var  =  array();                if (C('APP_GROUP_LIST') && !isset($_GET[C('VAR_GROUP')])){                    $var[C('VAR_GROUP')] = in_array(strtolower($paths[0]),explode(',',strtolower(C('APP_GROUP_LIST'))))? array_shift($paths) : '';                    if(C('APP_GROUP_DENY') && in_array(strtolower($var[C('VAR_GROUP')]),explode(',',strtolower(C('APP_GROUP_DENY'))))) {                        // 禁止直接访问分组                        exit;                    }                }                if(!isset($_GET[C('VAR_MODULE')])) {// 还没有定义模块名称                    $var[C('VAR_MODULE')]  =   array_shift($paths);                }                $var[C('VAR_ACTION')]  =   array_shift($paths);                // 解析剩余的URL参数                preg_replace('@(\w+)\/([^\/]+)@e', '$var[\'\\1\']=strip_tags(\'\\2\');', implode('/',$paths));                $_GET   =  array_merge($var,$_GET);            }            define('__INFO__',$_SERVER['PATH_INFO']);        }        // 获取分组 模块和操作名称        if (C('APP_GROUP_LIST')) {//项目分组设定,多个组之间用逗号分隔,例如'Home,Admin',默认为空            define('GROUP_NAME', self::getGroup(C('VAR_GROUP')));//默认的分组变量：g        }        //模块名        define('MODULE_NAME',self::getModule(C('VAR_MODULE')));//默认的模块变量：m        //操作名        define('ACTION_NAME',self::getAction(C('VAR_ACTION')));//默认的操作变量：a        // URL常量,'/index.php'        define('__SELF__',strip_tags($_SERVER['REQUEST_URI']));        // 当前项目地址,'/index.php'        define('__APP__',strip_tags(PHP_FILE));        // 当前模块和分组地址        if(defined('GROUP_NAME')) {            define('__GROUP__',(!empty($domainGroup) || strtolower(GROUP_NAME) == strtolower(C('DEFAULT_GROUP')) )?__APP__ : __APP__.'/'.GROUP_NAME);            define('__URL__',!empty($domainModule)?__GROUP__.$depr : __GROUP__.$depr.MODULE_NAME);        }else{        //"/index.php/Index"            define('__URL__',!empty($domainModule)?__APP__.'/' : __APP__.'/'.MODULE_NAME);        }        // 当前操作地址,"/index.php/Index/index"        define('__ACTION__',__URL__.$depr.ACTION_NAME);        //保证$_REQUEST正常取值        $_REQUEST = array_merge($_POST,$_GET);    }    /**     * 路由检测     * @access public     * @return void     */    static public function routerCheck() {        $return   =  false;        // 路由检测标签        tag('route_check',$return);        return $return;    }    /**     * 获得实际的模块名称     * @access private     * @return string     */    static private function getModule($var) {        $module = (!empty($_GET[$var])? $_GET[$var]:C('DEFAULT_MODULE'));//默认的模块名：Index        unset($_GET[$var]);        if(C('URL_CASE_INSENSITIVE')) {            // URL地址不区分大小写            // 智能识别方式 index.php/user_type/index/ 识别到 UserTypeAction 模块            $module = ucfirst(parse_name($module,1));        }        return strip_tags($module);//去除html标签    }    /**     * 获得实际的操作名称     * @access private     * @return string     */    static private function getAction($var) {        $action   = !empty($_POST[$var]) ?            $_POST[$var] :            (!empty($_GET[$var])?$_GET[$var]:C('DEFAULT_ACTION'));//默认的控制器名：index        unset($_POST[$var],$_GET[$var]);        //C('URL_CASE_INSENSITIVE'):URL是否区分大小写        return strip_tags(C('URL_CASE_INSENSITIVE')?strtolower($action):$action);    }    /**     * 获得实际的分组名称     * @access private     * @return string     */    static private function getGroup($var) {        $group   = (!empty($_GET[$var])?$_GET[$var]:C('DEFAULT_GROUP'));//默认的分组名：Home        unset($_GET[$var]);        //C('URL_CASE_INSENSITIVE'):URL是否区分大小写        return strip_tags(C('URL_CASE_INSENSITIVE') ?ucfirst(strtolower($group)):$group);    }}