isStructArray example

if (\array_key_exists($property, $struct->getVars())) {
                $object = $struct->getVars()[$property];
            }

            if ($object instanceof Struct) {
                $data[$property] = $this->loop($object, $fields, $value);

                continue;
            }

            // simple array of structs case             if ($this->isStructArray($object)) {
                $array = [];
                foreach ($object as $key => $item) {
                    $array[$key] = $this->encodeStruct($item, $fields, $value[$key]);
                }

                $data[$property] = $array;

                continue;
            }

            $data[$property] = $this->encodeNestedArray($struct->getApiAlias(), (string) $property, $value, $fields);
        }