Finding the final url of a redirect

In one of my websites there was a complicated mechanism for redirecting mobile users from desktop pages to their mobile versions. When I needed to get the mobile final url in order to use it in my rel=”alternate” links I used a starting url and followed the redirects until getting the final url.

Here is the code I used:

    $url="http://www.mysite.com/url";
    stream_context_set_default(array(
        'http' => array(
            'method' => 'HEAD'
        )
    ));
    $headers = get_headers($url, 1);
    if ($headers !== false && isset($headers['Location'])) {
        $finalurl=is_array($headers['Location']) ? array_pop($headers['Location']) : $headers['Location'];
    }

$url="http://www.mysite.com/url";

stream_context_set_default(array(

'http' => array(

'method' => 'HEAD'

)

));

$headers = get_headers($url, 1);

if ($headers !== false && isset($headers['Location'])) {

$finalurl=is_array($headers['Location']) ? array_pop($headers['Location']) : $headers['Location'];

}

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