$where['_string'] .= " (first_company_id='{$params['company_id']}' AND first_company_type='{$params['company_type']}') OR (second_company_id='{$params['company_id']}' AND second_company_type='{$params['company_type']}')";
$where['_string'] .= " (first_company_id='{$params['company_id']}' AND first_company_type='{$params['company_type']}') OR (second_company_id='{$params['company_id']}' AND second_company_type='{$params['company_type']}')";