UserController.php

<?php

class UserController
{
    public function lists()
    {
        // Create a fractal instance
        $fractal = new \League\Fractal\Manager();
        
        // to enable links support, we need to set a baseUrl on serializer
        $baseUrl = url('/api');
        $fractal->setSerializer(new \League\Fractal\Serializer\JsonApiSerializer($baseUrl));

        // Get Data from your database model
        $users = \App\User::paginate(25);

        // Pass this array (collection) into a resource, which will also have a "Transformer"
        // This "Transformer" can be a callback or a new instance of a Transformer object
        // Important, notice the Resource Key in the third parameter:
        $resource = new \League\Fractal\Resource\Collection($users, new \App\UserTransformer(), 'users');

        // Turn that into a structured array (handy for XML views or auto-YAML converting)
        $data = $fractal->createData($resource)->toArray();

        // OR, Turn all of that into a JSON string
        // $data = $fractal->createData($resource)->toJson();

        return $data;
    }
}

UserTransformer.php

<?php

class UserTransformer extends League\Fractal\TransformerAbstract
{
    $defaultIncludes = ['posts'];

    public function transform(\App\User $user): array
    {
        return [
            'id'      => (int) $user->id,
	    'name'    => $user->firstname . ' ' . $user->lastname,
	    'dob'    => $user->bob,
	];
    }

    public function includePosts(\App\User $user): \League\Fractal\Resource\Collection
    {
        return $this->collection($user->posts, new \App\PostTransformer(), 'posts');
    }
}