/**
* Make given string a proper URL
*
* @author Krzysztof Kalkhoff
*
* @param string $url
* @return string
*/
public static function makeUrl(string $url) : string
{
if (!preg_match("~^(?:f|ht)tps?://~i", $url)) {
$url = 'http' . (Server::isSecure() ? 's' : '') . "://" . $url;
}
return $url;
}