php日期函数例子：获取当月最后一天

2. /**
3. * 日期-获取当月最后一天
4. * @return int
5. */
6. public function get_lastday() {
7. if($this->month==2) {
8. $lastday = $this->is_leapyear($this->year) ? 29 : 28;
9. } elseif($this->month==4 || $this->month==6 || $this->month==9 || $this->month==11) {
10. $lastday = 30;
11. } else {
12. $lastday = 31;
13. }
14. return $lastday;
15. }
17. /**
18. * php日期-是否是闰年
19. * @return int
20. */
21. public function is_leapyear($year) {
22. return date('L', $year);
23. }

例子，php 日期函数之计算2个日期的差值

2. /**
3. * php日期-计算2个日期的差值
4. * @return int
5. */
6. public function get_difference($date, $new_date) {
7. $date = strtotime($date);
8. $new_date = strtotime($new_date);
9. return abs(ceil(($date - $new_date)/86400));
10. }