Selector::prepareOrderField

protected function prepareOrderField(array $field)
{
	$field = array_change_key_case($field, CASE_LOWER);

	$field['id'] = $this->prepareStringValue($field, 'id');
	$field['name'] = $this->prepareStringValue($field, 'name');
	if (empty($field['id']) || empty($field['name']))
	{
		return null;
	}

	return [
		'id' => $field['id'],
		'name' => $field['name']
	];
}