Code check ip reverse-ip

Code check ip reverse-ip cho bạn nào cần

<?php

ob_implicit_flush(1);error_reporting(E_NONE);

function reverse($ip){$OFF = 0;$domain = array();$contador=1;
do{   
    unset($url_dns);
    $url = 'http://api.search.live.net/json.aspx?AppId=7066FAEB6435DB963AE3CD4AC79CBED8B962779C&Query=IP:'.$ip.'&Sources=web&Web.Offset='.$OFF;
    $data  = json_decode(file_get_contents($url));

    foreach($data->SearchResponse->Web->Results as $value){
        $dms = parse_url($value->Url, PHP_URL_HOST);


    $url_dns[] = $dms;
                                }



    if($OFF % 4 == 0 ){
     $actual = $url_dns;
    }else{
      $pasado = $url_dns;
    }
    $OFF = $OFF + 10;

}while($actual != $pasado);

return $dns;
            }
$host = htmlentities($_GET['host'], ENT_QUOTES);$ip = gethostbyname($host);reverse($ip);
?>