更新

app/Services/DynamicService.php

@@ -54,7 +54,7 @@ class DynamicService
         }
         $data = [
           "content"=>$dynamicParam->content,
-          "img_url"=>$dynamicParam->img_url,
+          "img_url"=>json_encode($dynamicParam->img_url),
           "status"=>$dynamicParam->status,
           "type"=>$dynamicParam->type,
           "tag"=>$tag_ins,

app/Services/UserService.php

@@ -25,7 +25,7 @@ class UserService
         $ins = array();
         $ins['user_id'] = $param->user_id;
         $ins['content'] = htmlspecialchars($param->content);
-        $ins['img_url'] = $param->img_url;
+        $ins['img_url'] = json_encode($param->img_url);
         $ins['status'] = $param->status;
         UserProblemModel::query()->create($ins);
         return true;