PHP function to resolve a short URL in to its full redirected URL

resolve_url.php

<?php

function resolve_url($url) {		
    $headers = get_headers($url);
    $headers = array_reverse($headers);
    foreach($headers as $header) {
        if (strpos($header, 'Location: ') === 0) {
            $url = str_replace('Location: ', '', $header);
            break;
        }
    }
    return $url;
}