private function openInBrowser($url)
{
$url = $this->replacePlaceholders($url);
switch (php_uname('s')) {
case "Darwin":
$cmd = "open";
break;
case "Windows NT":
$cmd = "start";
break;
case "Linux":
default:
$cmd = "xdg-open";
break;
}
exec("{$cmd} {$url}");
}