github地址：

代码加上一些注释，方便以后再看。

      '[^/]+',  ':num' => '[0-9]+',  ':all' => '.*', ); public static $error_callback; /**  * Defines a route w/ callback and method  * 注册路由，把注册的方法(GET,POST..)，uri，closure分别push到对应的数组中  */ public static function __callstatic( $method, $params ) {  $uri = $params[0];  $callback = $params[1];  array_push( self::$routes, $uri );  array_push( self::$methods, strtoupper( $method ) );  array_push( self::$callbacks, $callback ); } /**  * Defines callback if route is not found  * 可以自定义没找到路由时执行的方法  */ public static function error( $callback ) {  self::$error_callback = $callback; } /**  * 自定义是否匹配到一次就停止，true停止，false不停止即可以定义多个同名路由，通过foreach全部执行  * @param  boolean $flag true / false  * @return none          */ public static function haltOnMatch( $flag = true ) {  self::$halts = $flag; } /**  * Runs the callback for the given request  * 根据当前的uri匹配对应的路由并执行  */ public static function dispatch() {  $uri = parse_url( $_SERVER['REQUEST_URI'], PHP_URL_PATH ); //路径部分(包括前边的/)，不包括参数  $method = $_SERVER['REQUEST_METHOD'];   //方法 GET / POST / PUT / DELETE  $searchs = array_keys( static::$patterns );  $replaces = array_values( static::$patterns );  $found_route = false;  //check if route is defined without regex,检查是否定义了路由(非:any,:all形式的)  if ( in_array( $uri, self::$routes ) ) {   $route_pos = array_keys( self::$routes, $uri ); //返回匹配路由的键值，可能多个(同名路由)   foreach ( $route_pos as $route ) {    if ( self::$methods[$route] == $method ) {  //寻找路由对应的方法名(GET,POST...),确定是否注册。     $found_route = true;     //if route is not an object,检测对应闭包函数是function还是controller route     if ( !is_object( self::$callbacks[$route] ) ) {      //grab all parts based on a / separator 控制器路由      $parts = explode( '/', self::$callbacks[$route] );      //collect the last index of the array      $last = end( $parts );      //grab the controller name and method call      $segments = explode( '@', $last );      //instanitate controller      $controller = new $segments[0]();      //call method      $controller->$segments[1]();      if ( self::$halts )return;   //匹配一次就停止?     }else {      //call closure      call_user_func( self::$callbacks[$route] );        if ( self::$halts )return;     }    }   }  }else {   //check if defined with regex 是否注册了正则路由(:any,:num..)   $pos = 0;   foreach ( self::$routes as $route ) {    if ( strpos( $route, ':' ) !== false ) {     $route = str_replace( $searchs, $replaces, $route );    }    if ( preg_match( '#^'.$route.'$#', $uri, $matched ) ) {     if ( self::$methods[$pos] == $method ) {      $found_route = true;      array_shift( $matched );      if ( !is_object( self::$callbacks[$pos] ) ) {       //grab all parts based on a / separator       $parts = explode( '/', self::$callbacks[$pos] );       //collect the last index of the array       $last = end( $parts );       //grab the controller name and method call       $segments = explode( '@', $last );       //instanitate controller       $controller = new $segments[0]();       //call method and pass any extra parameters to the method       $controller->$segments[1]( implode( ",", $matched ) );       if ( self::$halts ) {        return;       }else {        call_user_func_array( self::$callbacks[$pos], $matched );        if ( self::$halts ) return;       }      }     }    }    $pos++;   }  }  //return the error callback if the route was not found  if ( $found_route == false ) {   if ( !self::$error_callback ) {    self::$error_callback = function() {     header( $_SERVER['SERVER_PROTOCOL']." 404 Not Found" ); //请求页面时通信协议的名称和版本。例如，“HTTP/1.0”。     echo '404';    }   }   call_user_func( self::$error_callback );  } }}