Tobscure\JsonApi\ElementInterface::toIdentifier PHP Method

    public function toIdentifier();

 /**
  * Map everything to an array.
  *
  * @return array
  */
 public function toArray()
 {
     $array = [];
     if (!empty($this->data)) {
         $array['data'] = $this->data->toIdentifier();
     }
     if (!empty($this->meta)) {
         $array['meta'] = $this->meta;
     }
     if (!empty($this->links)) {
         $array['links'] = $this->links;
     }
     return $array;
 }