code: public function open($msgId, $index)
      {
          $params = [
              'msg_data_id' => $msgId,
              'index' => $index,
          ];
  
          return $this->parseJSON('json', [self::API_OPEN_COMMENT, $params]);
      }
docs: Open article comment.
  
  @param string $msgId
  @param int    $index
  
  @return \EasyWeChat\Support\Collection