Get Facebook video ID

// Temp store the exploded URL
$tmp = explode('/', $url);

// Get the end of the array and go back two
$videos = strtolower($tmp[count($tmp) - 2]);

// Check if the URL is /username/videos/
if ($videos == 'videos') {
    // Then the ID is located back one
    $id = $tmp[count($tmp) - 1];

    return $id;

}else {
    // They used the ?v=id URL
    parse_str(parse_url($url)['query'], $query);

    // Check if it's empty or not
    if (!empty($query['v'])) {
        // The ID is within the ?v=
        $id = $query['v'];
    } else {
        // Oh crap shoot, it's neither!
        var_dump($tmp);
    }
}