* Refactor holidayModel::getDaysBetween, and modify its unit test.

module/holiday/model.php

@@ -236,21 +236,22 @@ class holidayModel extends model
      }
 
     /**
-     * Get diff days.
+     * 获取开始和结束日期间的日期。
+     * Get the dates between the begin and end.
      *
      * @param  string  $begin
      * @param  string  $end
      * @access public
-     * @return bool
+     * @return array
      */
-     public function getDaysBetween($begin, $end)
+     public function getDaysBetween(string $begin, string $end): array
      {
          $beginTime = strtotime($begin);
          $endTime   = strtotime($end);
          $days      = ($endTime - $beginTime) / 86400;
 
          $dateList  = array();
-         for($i = 0; $i <= $days; $i ++) $dateList[] = date('Y-m-d', strtotime("+$i days", $beginTime));
+         for($i = 0; $i <= $days; $i ++) $dateList[] = date('Y-m-d', strtotime("+{$i} days", $beginTime));
 
          return $dateList;
      }

module/holiday/test/holiday.class.php

@@ -197,14 +197,15 @@ class holidayTest
     }
 
     /**
-     * Test getDaysBetweenTest method.
+     * 测试获取开始和结束日期之间的日期。
+     * Test get the dates between the begin and end.
      *
      * @param  string    $begin
      * @param  string    $end
      * @access public
-     * @return int
+     * @return int|array
      */
-    public function getDaysBetweenTest($begin, $end)
+    public function getDaysBetweenTest(string $begin, string $end): int|array
     {
         $objects = $this->objectModel->getDaysBetween($begin, $end);
 

module/holiday/test/model/getdaysbetween.php

@@ -1,5 +1,6 @@
 #!/usr/bin/env php
 <?php
+declare(strict_types=1);
 include dirname(__FILE__, 5) . '/test/lib/init.php';
 include dirname(__FILE__, 2) . '/holiday.class.php';
 su('admin');
@@ -24,4 +25,4 @@ r($holiday->getDaysBetweenTest('2022-04-01', '2022-04-21')) && p() && e('21');
 r($holiday->getDaysBetweenTest('2022-05-23', '2022-05-30')) && p() && e('8');   //返回2022-05-23到2022-05-30之间的天数
 r($holiday->getDaysBetweenTest('2021-01-01', '2022-01-01')) && p() && e('366'); //测试传入一间隔一整年的两天
 r($holiday->getDaysBetweenTest('2022-05-07', '2022-05-08')) && p() && e('2');   //返回2022-05-07到2022-05-08之间的天数
-r($holiday->getDaysBetweenTest('2022-05-07', '2022-05-07')) && p() && e('1');   //测试传入同一天的情况
+r($holiday->getDaysBetweenTest('2022-05-07', '2022-05-07')) && p() && e('1');   //测试传入同一天的情况