code: public function jsonSerialize()
      {
          $json = [];
  
          if (null !== $this->mediaId) {
              $json['mediaId'] = $this->mediaId;
          }
          if (null !== $this->mediaUrl) {
              $json['mediaUrl'] = $this->mediaUrl;
          }
          if (null !== $this->pageUrl) {
              $json['pageUrl'] = $this->pageUrl;
          }
          if (null !== $this->context && !empty($this->context)) {
              $json['context'] = $this->context;
          }
          if (null !== $this->language) {
              $json['language'] = $this->language;
          }
  
          return $json;
      }
docs: Gets all data that should be available in a json representation.
  
  @return array an associative array of the available variables