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<?php

// FOLLOW A SINGLE REDIRECT:
// This makes a single request and reads the "Location" header to determine the
// destination. It doesn't check if that location is valid or not.
function get_redirect_target($url)
{
    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_HEADER, 1);
    curl_setopt($ch, CURLOPT_NOBODY, 1);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    $headers = curl_exec($ch);
    curl_close($ch);

    // Check if there's a Location: header (redirect)
    if (preg_match('/^Location: (.+)$/im', $headers, $matches))
        return trim($matches[1]);

    // If not, there was no redirect so return the original URL
    // (Alternatively change this to return false)
    return $url;
}

// FOLLOW ALL REDIRECTS:
// This makes multiple requests, following each redirect until it reaches the
// final destination.
function get_redirect_final_target($url)
{
    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_NOBODY, 1);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1); // follow redirects
    curl_setopt($ch, CURLOPT_AUTOREFERER, 1); // set referer on redirect
    curl_exec($ch);
    $target = curl_getinfo($ch, CURLINFO_EFFECTIVE_URL);
    curl_close($ch);

    if ($target)
        return $target;

    return false;
}