修改购物车接口

@@ -203,10 +203,7 @@ function wpjam_array_push($array, $data=null, $key=false){
     }
 }
 
-if (!function_exists('cal_days_in_month'))
-{
-    function cal_days_in_month($calendar, $month, $year)
-    {
-        return date('t', mktime(0, 0, 0, $month, 1, $year));
-    }
+function days_in_month($month, $year) {
+    // calculate number of days in a month
+    return $month == 2 ? ($year % 4 ? 28 : ($year % 100 ? 29 : ($year % 400 ? 28 : 29))) : (($month - 1) % 7 % 2 ? 30 : 31);
 }
\ No newline at end of file

@@ -212,7 +212,7 @@ class Member extends Api
         $betweenTime = ['1970-1-1', date('Y-m-d')];
         if ($date) {
             $dateArr = explode('-', $date);
-            $lastDay = cal_days_in_month(CAL_GREGORIAN, $dateArr[1], $dateArr[0]);
+            $lastDay = days_in_month( $dateArr[1], $dateArr[0]);
             $lastDate = $dateArr[0] . '-' . $dateArr[1] . '-' . $lastDay;
             $betweenTime = [$date, $lastDate];
         }