$url = "http://siteadi.com";
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, TRUE);
curl_setopt($ch,CURLOPT_ENCODING , "");
$returnData=curl_exec($ch);
$responseCode=curl_getinfo($ch,CURLINFO_HTTP_CODE);
if ($responseCode == 404){
echo 'Bulunamadı';
}