##验证日期格式：YYYY-MM-DD ~~~ function checkDateFormat($date) { // match the format of the date if (preg_match(“/^([0-9]{4})-([0-9]{2})-([0-9]{2})$/”, $date, $parts)) { // check whether the date is valid of not if (checkdate($parts[2], $parts[3], $parts[1])) { return true; } else { return false; } } else { return false; } } ~~~