To detect a 301 redirect from a domain to another, just use the following PHP code. For this example we'll use www.obrasocialcajamadrid.es, which redirects to www.fundacionmontemadrid.es. Replace it with the URL you prefer:
$url = "www.obrasocialcajamadrid.es";
function detect_redirect ($url) {
$ch = curl_init();
curl_setopt($ch, CURLOPT_HEADER, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_URL, $url);
$out = curl_exec($ch);
$out = str_replace("\r", "", $out);
$headers_end = strpos($out, "\n\n");
if( $headers_end !== false ) {
$out = substr($out, 0, $headers_end);
}
$headers = explode("\n", $out);
foreach($headers as $header) {
if( substr($header, 0, 10) == "Location: " ) {
$target = substr($header, 10);
$pieces = explode("?", $target);
}
}
return $pieces[0];
}
$result = detect_redirect($url);
echo $result;