王正东博客

//检查日期是否合法日期
function check_date($date) { 
	$dateArr = explode("-", $date);
	if (is_numeric($dateArr[0]) && is_numeric($dateArr[1]) && is_numeric($dateArr[2])) {
		return checkdate($dateArr[1],$dateArr[2],$dateArr[0]);
	}
	return false;
}


//检查时间是否合法时间
function check_time($time) { 
	$timeArr = explode(":", $time);
	if (is_numeric($timeArr[0]) && is_numeric($timeArr[1]) && is_numeric($timeArr[2])) {
		if (($timeArr[0] >= 0 && $timeArr[0] <= 23) && ($timeArr[1] >= 0 && $timeArr[1] <= 59) && ($timeArr[2] >= 0 && $timeArr[2] <= 59))
			return true;
		else
			return false;
	}
	return false;
}


//时间比较函数，返回两个日期相差几秒、几分钟、几小时或几天
function DateDiff($date1, $date2, $unit = "") { 
	switch ($unit) {
		case 's':
			$dividend = 1;
			break;
		case 'i':
			$dividend = 60;
			break;
		case 'h':
			$dividend = 3600;
			break;
		case 'd':
			$dividend = 86400;
			break;
		default:
			$dividend = 86400;
	}
	$time1 = strtotime($date1);
	$time2 = strtotime($date2);
	if ($time1 && $time2)
		return (float)($time1 - $time2) / $dividend;
	return false;
}