[GitHub] [apisix] sniper-xx commented on issue #4193: request help: how to resovle cjson decode empty array and emtpy object separately?

[GitBox <gi...@apache.org>]

sniper-xx commented on issue #4193:
URL: https://github.com/apache/apisix/issues/4193#issuecomment-834050995


   ```lua
   local function wrap_result(conf, ctx)
       local result = {
           msg="ok",
           code= resp_code,
           elapsed = ngx.time()-elapsed,
           data = "__placeholder__",
           success=true
       }
   
       --如果完成后台数据读取,重新进行Json结果封装
       result['data'] = cjson_decode(data_buffer)
       ngx.arg[1] = cjson_encode(result)
       --local wrap_string = cjson_encode(result)
       --local ret_content = ngx.re.sub(wrap_string,'"__placeholder__"',data_buffer,'jo')
       --ngx.arg[1] = ret_content
       ngx.arg[2] = true
   end
   ```


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