Reverse IP

<title>Reverse IP - INJ3CTOR_M4</title>
<h1>Reverse IP</h1>
<form method=POST>
IP: <input type=text size=30 name=ip>
<input type=submit value=Start.>
</form>
<?php
#Reverse iP
@set_time_limit(0);
if(isset($_POST['ip'])){
$ip=trim($_POST['ip']);
echo"<font size='2' face='Courier'>Reverse IP results for $ip<br />==============<br /><br />There are ".sizeof(bing($ip))." domains hosted on this server.<br />The complete listing of these is below:<br /><br />";
echo'<table border="1"><tr><td>Domain</td></tr>';
foreach(bing($ip) as $domain){
echo"<tr><td>$domain</td></tr>";
}
echo'</font>';
}
function bing($ip){
$ch=curl_init();
$i=1;
while($i){
curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch,CURLOPT_URL,"http://www.bing.com/search?q=ip%3A$ip&first=$i");
curl_setopt($ch,CURLOPT_COOKIEFILE,'cookie.txt');
curl_setopt($ch,CURLOPT_COOKIEJAR,'cookie.txt');
curl_setopt($ch,CURLOPT_USERAGENT,'msnbot/1.0 (+http://search.msn.com/msnbot.htm)');
curl_setopt($ch,CURLOPT_ENCODING,"gzip, deflate, compress");
$data=curl_exec($ch);
preg_match_all('/<h2><a href="(.*?)"/',$data,$matches);
$links=array_unique($matches[1]);
foreach($links as $link){
$alllinks[]=correctit($link);
}
if(!preg_match('#"sw_next"#',$data)) break;
$i+=10;
}
curl_close($ch);
if(!empty($alllinks) && is_array($alllinks)){
return array_unique($alllinks);
}
}
function correctit($http){
if((strpos(trim($http), "http://") === 0) || (strpos(trim($http), "https://") === 0)){
return parse_url($http, PHP_URL_HOST);
}else{
return trim($http);
}
}