private static function parseOption($arg, $longName, $shortName = null)
{
$longOption = '--' . $longName . '=';
$shortOption = '-' . $shortName . '=';
foreach ([$longOption, $shortOption] as $option) {
if (0 !== strpos($arg, $option)) {
continue;
}
return substr($arg, strlen($option));
}
}