php判断该月有多少天

Posted 2021-01-02 来自php星球的丸子

1. 
   /**
2.  * 判断某年的某月有多少天
3.  * @return [type] [description]
4.  */
5. function daysInmonth($year=‘‘,$month=‘‘){
6.      if(empty($year)) $year = date(‘Y‘);
7.      if(empty($month)) $month = date(‘m‘);
8.      if (in_array($month, array(1, 3, 5, 7, 8, ‘01‘, ‘03‘, ‘05‘, ‘07‘, ‘08‘, 10, 12))) { 
9.             $text = ‘31‘;         //月大
10. }elseif ($month == 2 || $month == ‘02‘){ 
11. if ( ($year % 400 == 0) || ( ($year % 4 == 0) && ($year % 100 !== 0) ) ) {   //判断是否是闰年 
12.     $text = ‘29‘;        //闰年2月
13. } else { 
14. $text = ‘28‘;          //平年2月
15. } 
16. } else { 
17. $text = ‘30‘;             //月小
18. }
20. return $text;

21.}

 

/**

1.  * 判断某年的某月有多少天
2.  * @return [type] [description]
3.  */ 
4. function daysInmonth1($year=‘‘,$month=‘‘){
5.      if(empty($year)) $year = date(‘Y‘); 
6.     if(empty($month)) $month = date(‘m‘);
7.      $day = ‘01‘;
8.     
9.      //检测日期是否合法
10. if(!checkdate($month,$day,$year)) return ‘输入的时间有误‘;
12. //获取当年当月第一天的时间戳(时,分,秒,月,日,年)
13. $timestamp = mktime(0,0,0,$month,$day,$year);
14. $result = date(‘t‘,$timestamp);
15. return $result;

16.}