<?php

require 'vendor/autoload.php';

use GuzzleHttp\Client as GuzzleClient;
use Http\Adapter\Guzzle7\Client as GuzzleAdapter;
use Nyholm\Psr7\Factory\Psr17Factory;

// PSR-18 HTTP client
$psr18 = new GuzzleAdapter(new GuzzleClient([
    'timeout' => 10,
]));

// PSR-17 request/stream factory
$psr17RequestFactory = new Psr17Factory();

// ISBNdb client
$client = new \Verbanent\Isbndb\IsbndbClient($psr18, $psr17RequestFactory, 'xxx');
$book = $client->books()->byIsbn()->execute('978-83-8202-257-5');
var_dump($book);