update

app/Models/CourseSign.php

@@ -176,10 +176,10 @@ class CourseSign extends SoftDeletesModel
      * @param array|null $course_ids 课程ID（仅在自定义时间时生效）
      * @param bool $retList 是否返回列表
      */
-    public static function yhInvestedTotal($end_date = null, $retList = false)
+    public static function yhInvestedTotal($start_date, $end_date = null, $retList = false)
     {
         // 默认时间：获取所有学员，不限制课程
-        $userIds = self::getStudentList(null, $end_date, 1, null)->get()->pluck('user_id');
+        $userIds = self::getStudentList($start_date, $end_date, 1, null)->get()->pluck('user_id');
 
         // 获取这些学员所在的被投企业
         $companies = Company::whereHas('users', function ($query) use ($userIds) {