PHP determines how many days of the month

2. 
   /**
4.  * determine how many days a certain month of a year
6.  * @return [Type][description]
8. */
10. function DaysInMonth ($year = ', $month = ') {
12. if (empty ($year)) $year = Date (' Y ');
14. if (empty ($month)) $month = Date (' m ');
16. if (In_array ($month, Array (1, 3, 5, 7, 8, ' 01 ', ' 03 ', ' 05 ', ' 07 ', ' 08 ', 10, 12))) {
18. $text = ' 31 '; // month-old
20. }elseif ($month = = 2 | | $month = = ' 02 ') {
22. if (($year% 400 = = 0) | | (($year% 4 = = 0) && ($year% 100!== 0))) { // to determine if a leap Year
24. $text = ' 29 '; // Leap Year 2 Month
26. }else {
28. $text = ' 28 '; // Common year 2 Month
30. }
32. }else {
34. $text = ' 30 '; // Month Small
36. }
40. return $text;

21.}

/**

1.  * determine how many days a certain month of a year
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. $day = ' 01 ';
9. // whether the detection date is legal
10. if (!checkdate ($month, $day, $year)) return ' entered in the wrong time ';
12. // gets the timestamp of the first day of the current month ( hours , minutes , seconds , months , Day , years )
13. $timestamp = Mktime (0,0,0, $month, $day, $year);
14. $result = date (' t ', $timestamp);
15. return $result;

16.}

PHP determines how many days of the month