，这段代码爆错。

求助，这段代码爆错。。

PHP code

<!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->function MU( $url, $type, $vars = array( ), $domain = false ){        $path = explode( "/", trim( $url, "/" ) );        $model = strtolower( $path[1] );        $action = isset( $path[2] ) ? strtolower( $path[2] ) : "";        $http = ud( $path );case "article" :default :        switch ( $type )        {                if ( !isset( $vars['id'] ) )                {                        unset( $path[0] );                        $url = implode( "/", $path )."/";                        $newurl = $url;                }                else                {                        if ( $UN_1 || strtolower( GROUP_NAME ) == strtolower( c( "DEFAULT_GROUP" ) ) )                        {                                unset( $path[0] );                                $url = implode( "/", $path )."/";                        }                        $newurl = $url.$vars['id'].$vars['suffix'];                }                break;        case "typelist" :                if ( strtolower( GROUP_NAME ) == strtolower( c( "DEFAULT_GROUP" ) ) )                {                        unset( $path[0] );                        $url = implode( "/", $path );                }                $newurl = $url.$vars['suffix'];                break;        }        return $http.$newurl;}

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