$client = Keycloak\Admin\KeycloakClient::factory([
    'realm' => 'master',
    'username' => 'admin',
    'password' => '1234',
    'client_id' => 'admin-cli',
    'baseUri' => 'http://127.0.0.1:8180',
]);

$client->getUsers();

//Result
// Array of users
/*
[
     [
       "id" => "39839a9b-de08-4d2c-b91a-a6ce2595b1f3",
       "createdTimestamp" => 1571663375749,
       "username" => "admin",
       "enabled" => true,
       "totp" => false,
       "emailVerified" => false,
       "disableableCredentialTypes" => [
         "password",
       ],
       "requiredActions" => [],
       "notBefore" => 0,
       "access" => [
         "manageGroupMembership" => true,
         "view" => true,
         "mapRoles" => true,
         "impersonate" => true,
         "manage" => true,
       ],
     ],
   ]
*/

$client->createUser([
    'username' => 'test',
    'email' => '[email protected]',
    'enabled' => true,
    'credentials' => [
        [
            'type'=>'password',
            'value'=>'1234',
        ],
    ],
]);

use GuzzleHttp\Middleware;
use Psr\Http\Message\RequestInterface;

$client = Keycloak\Admin\KeycloakClient::factory([
    ...
    'middlewares' => [
        // throws exceptions when request fails
        Middleware::httpErrors(),
        // other custom middlewares
        Middleware::mapRequest(function (RequestInterface $request) {
            return $request;
        }),
    ],
]);

class CustomTokenStorage implements TokenStorage 
{
    public function getToken() 
    {
        // TODO
    }
    
    public function saveToken(array $token)
    {
        // TODO
    }
}

$client = Keycloak\Admin\KeycloakClient::factory([
    ...
    'token_storage' => new CustomTokenStorage(),
]);

$client = KeycloakClient::factory([
...
    'custom_operations' => [
        'getUsersByAttribute' => [
            'uri' => '/auth/realms/{realm}/userapi-rest/users/search-by-attr',
            'description' => 'Get users by attribute Returns a list of users, filtered according to query parameters',
            'httpMethod' => 'GET',
            'parameters' => [
                'realm' => [
                    'location' => 'uri',
                    'description' => 'The Realm name',
                    'type' => 'string',
                    'required' => true,
                ],
                'attr' => [
                    'location' => 'query',
                    'type' => 'string',
                    'required' => true,
                ],
                'value' => [
                    'location' => 'query',
                    'type' => 'string',
                    'required' => true,
                ],
            ],
        ],
    ]
]);