Adding Query string params to a Guzzle GET request?

Another variation of the correct answer:

$params = [
   'query' => [
      'option_1' => string,
      'option_2' => string
   ]
];

And then call your request:

$response = $guzzle_client->request('GET','/api.com',$params);

I have the same problem. I found solution

public static function getGroupList($current=false) {
$response = self::getRestClient()->get(
    [
        'domains/{domainId}/pricelists',
        ['domainId' => self::getDomainId()]
    ],
    [
        'query' => [
        current => $current
        ]
    ]
);

return new RestResponse($response);

Try

$response = $client->get(
        [
            $config->Layout['server'],
            []
        ],
        [
            'query' => [
                $config->Layout['switches'], // ([ '-db' => 'database', '-lay' => 'layout', '-find' => true)
                $config->Layout['options'], // other params
            ]
        ]
);