protected function getOptions($optionNames = null)
{
$options = [];
if ($optionNames === null) {
$optionNames = $this->optionNames;
}
foreach ($optionNames as $option) {
$converter = 'convert' . ucfirst($option);
$value = method_exists($this, $converter) ? $this->{$converter}() : $this->{$option};
if ($value === null) {
continue;
}
$options[$option] = $value;
}
return $options;
}