php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

1. function DateDiff($date1, $date2, $unit = "") { //时间比较函数，返回两个日期相差几秒、几分钟、几小时或几天
2. switch ($unit) {
3. case 's':
4. $dividend = 1;
5. break;
6. case 'i':
7. $dividend = 60; //oSPHP.COM.CN
8. break;
9. case 'h':
10. $dividend = 3600;
11. break;
12. case 'd':
13. $dividend = 86400;
14. break; //开源OSPhP.COM.CN
15. default:
16. $dividend = 86400;
17. }
18. $time1 = strtotime($date1);
19. $time2 = strtotime($date2);
20. if ($time1 && $time2)
21. return (float)($time1 - $time2) / $dividend;
22. return false;
23. }

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几天, 几分钟, 几秒