Getting redirected url

How to get the redirected url? for example http://fromdomain.com/redirect.php?id=xxx redirected to http://todomain.com or http://todomain.com/page.htm where fromdomain.com is not my site, is it possible to get the redirected url using php?

 

function get_final_location($url)
{
    $headers = @get_headers($url);
   
    foreach ((array)$headers AS $header)
    {
        if (preg_match('/Location\s*:\s*(https?:[^;\s\n\r]+)/i', $header, $redirect))
        {
            return get_final_location($redirect[1]);
        }
    }
   
    return $url;
}

PHP:

This gets the final URL, even if the page is redirected multiple times.

 

Thanks for the reply. Is there any alternative for get_headers for PHP 4?

 

Does the following function works for you? I grabbed it instantly from php.net
Should be abled to work on PHP4.

<?php
if(!function_exists('get_headers'))
{
    function get_headers($url,$format=0)
    {
        $url=parse_url($url);
        $end = "\r\n\r\n";
        $fp = fsockopen($url['host'], (empty($url['port'])?80:$url['port']), $errno, $errstr, 30);
        if ($fp)
        {
            $out  = "GET / HTTP/1.1\r\n";
            $out .= "Host: ".$url['host']."\r\n";
            $out .= "Connection: Close\r\n\r\n";
            $var  = '';
            fwrite($fp, $out);
            while (!feof($fp))
            {
                $var.=fgets($fp, 1280);
                if(strpos($var,$end))
                    break;
            }
            fclose($fp);

            $var=preg_replace("/\r\n\r\n.*\$/",'',$var);
            $var=explode("\r\n",$var);
            if($format)
            {
                foreach($var as $i)
                {
                    if(preg_match('/^([a-zA-Z -]+): +(.*)$/',$i,$parts))
                        $v[$parts[1]]=$parts[2];
                }
                return $v;
            }
            else
                return $var;
        }
    }
}
?>

PHP:

 

Another alternative is to use curl, it tells you stats like how long it took and where it ended up with curl_getinfo after your curl_exec call

 

Is this script to achieve http://mydomain.com/go.php?http://microsoft.com

Basically I want all links that users click should go through my home url.

Makes sense ?

 

okay, just want to say thanks for all replies.