输出 JSON 格式方便调试

application/controllers/information.php

@@ -1062,8 +1062,9 @@ class Information extends CI_Controller
             $feedback_list = $this->Feedback_model->get_feedback_by_city_name($city_name, 5);
             $feedback_city_list[$city_name] = $feedback_list;
           }
-
-          var_dump($feedback_city_list);
+        
+          header('Content-Type: application/json');
+          echo json_encode($feedback_city_list);
           
           // $feedback_content = $this->load->view(
           //   'mobile_first/ah-feedback-30-list',