* 过滤外站链接
     * @param array $local_domain  本站域名 数组
     * @param string $message    文本内容
     */
    function replace_outer_links($local_domain_arr, $message) {

        $pattern= \'/<[^>]*href=[\\\'\\\"]http[s]?:\\/\\/(?!\' ;
        $i = 0 ;
        foreach ($local_domain_arr as $local_domain){
            if($i==0){
                 $pattern .= \'www.\' .$local_domain.\'|\'.$local_domain.\'|[\\w\\_]+\\.\'.$local_domain ;
            }else{
                 $pattern .= \'|www.\' .$local_domain.\'|\'.$local_domain.\'|[\\w\\_]+\\.\'.$local_domain ;
            }
             $i++ ;
        }
        $pattern .=\')[^\\\'^\\\"]*[\\\'\\\"][^>]*>(.+?)<\\/a>/is\';  
        return preg_replace($pattern,\'$1\',$message);
    }