PHP get 301 Jump URL

The code is as follows:


/**


* Get_redirect_url ()


* Gets The address of the provided URL redirects to,


* or FALSE if there ' s no redirect.  


 *


* @param string $url


* @return String


 */


function Get_redirect_url ($url) {


$redirect _url = null;  





$url _parts = @parse_url ($url);


if (! $url _parts) return false;


if (!isset ($url _parts[' host ')) return false; Can ' t process relative URLs


if (!isset ($url _parts[' path ')) $url _parts[' path ' = '/';





$sock = Fsockopen ($url _parts[' host '), (Isset ($url _parts[' Port ')? (int) $url _parts[' Port ']: $errno, $ERRSTR, 30);


if (! $sock) return false;

$request = "Head". $url _parts[' path ']. (Isset ($url _parts[' query ')? '?'. $url _parts[' query ']: ". "Http/1.1rn";  


$request. = ' Host: '. $url _parts[' host ']. "RN";  


$request. = "Connection:closernrn";  


fwrite ($sock, $request);


$response = ';


while (!feof ($sock)) $response. = Fread ($sock, 8192);


fclose ($sock);


if (Preg_match ('/^location: (. +?) $/m ', $response, $matches)) {


if (substr ($matches [1], 0, 1) = = "/")


return $url _parts[' scheme '. "://" . $url _parts[' host ']. Trim ($matches [1]);


Else


return Trim ($matches [1]);





} else {


return false;


    }





}


/**


* get_all_redirects ()


* Follows and collects all redirects, in order, for the given URL.  


 *


* @param string $url


* @return Array


 */


function Get_all_redirects ($url) {


$redirects = Array ();


while ($newurl = Get_redirect_url ($url)) {


if (In_array ($newurl, $redirects)) {


break;


        }


$redirects [] = $newurl;


$url = $newurl;


    }


return $redirects;


}