magento2-graphql-client.php

<?php

require __DIR__ . "/app/bootstrap.php";

use Magento\Framework\App\Bootstrap;
use Magento\Framework\App\ObjectManager\ConfigLoader;
use GuzzleHttp\Client;
use Magento\Framework\Stdlib\ArrayManager;

$bootstrap = Bootstrap::create(BP, $_SERVER);
$objectManager = $bootstrap->getObjectManager();

/** Configure the Object Manager **/
$configurations = $objectManager->get(ConfigLoader::class)->load('global');
$objectManager->configure($configurations);

/** @var ArrayManager $arrayManager */
$arrayManager = $objectManager->get(ArrayManager::class);

// PoC starts here

$queryString = "query{
  cmsBlocks(identifiers: [\"my-block\"]){
    items {
      title
      identifier
      content
    }
  }
}";

$client = new Client([
    'base_uri' => 'https://www.magento2-store.com',
    'headers' => ['Content-Type' => 'application/json'],
]);

$result = $client->post('graphql', ['json' => [
    'query' => $queryString,
]]);

$graphQlResponse = json_decode($result->getBody(), true);

$cmsBlocks = $arrayManager->get('data/cmsBlocks/items', $graphQlResponse);

var_dump($cmsBlocks);