My Own Keyless Fractal Serializer

DataArraySerializer.php

<?php

namespace App\Serializers;

use League\Fractal\Serializer\JsonApiSerializer;

use League\Fractal\Resource\ResourceInterface;
class DataArraySerializer extends JsonApiSerializer
{
    /**
     * Serialize an item resource
     *
     * @param string $resourceKey
     * @param array $data
     *
     * @return array
     */
    public function collection($resourceKey, array $data)
    {
        return ($resourceKey && $resourceKey !== 'data') ? array($resourceKey => $data) : $data;
    }

    public function item($resourceKey, array $data)
    {
        return ($resourceKey && $resourceKey !== 'data') ? array($resourceKey => $data) : $data;
    }
    public function includedData(ResourceInterface $resource, array $data)
    {
        $serializedData = array();
        $linkedIds = array();
        foreach ($data as $value) {
            foreach ($value as $includeKey => $includeValue) {
                foreach ($includeValue[$includeKey] as $itemValue) {
                    if (!array_key_exists('id', $itemValue)) {
                        $serializedData[$includeKey][] = $itemValue;
                        continue;
                    }

                    $itemId = $itemValue['id'];
                    if (!empty($linkedIds[$includeKey]) && in_array($itemId, $linkedIds[$includeKey], true)) {
                        continue;
                    }

                    $serializedData[$includeKey][] = $itemValue;
                    $linkedIds[$includeKey][] = $itemId;
                }
            }
        }

        return empty($serializedData) ? array() : $serializedData;
    }
}