How to get video post URL about tumblr.php HOT 3 OPEN

$remote_url = null;
$attempts = 0;
$found = false;
do {
    $info = $client->getBlogPosts($blogName, ['type' => 'video', 'limit' => 1]);
    if (!empty($info) && !empty($info->posts) && !empty($info->posts[0])) {
        if ($info->posts[0]->timestamp >= $posting_init_on->timestamp) {
            $url = $info->posts[0]->source_url;
            $parsed_source_url = parse_url($url);
            $query = $parsed_source_url['query'];
            if (!empty($query)) {
                parse_str($query, $parsed_query);
                if (!empty($parsed_query) && $parsed_query['z'] == $source_url) {
                    $remote_url = $info->posts[0]->post_url;
                    $found = true;
                }
            }
        }
    }
    $attempts++;
    sleep(($attempts + 1) * 5);
} while ($attempts < 15 && $found === false);