PHP Decode

<?php

Error_Reporting(E_ALL);
ini_set('display_errors', 1);

if (file_exists(__DIR__ . '/credentials.php')) {
    require_once __DIR__ . '/credentials.php';
} else {
    die('cp php_examples/credentials.php.dist php_examples/credentials.php && edit' . PHP_EOL);
}

try {
    TDApi\LogConfiguration::setLogVerbosityLevel(\TDApi\LogConfiguration::LVL_ERROR);

    $client = new TDLib\JsonClient();
    $client->getAuthorizationState();

    $tdlibParams = new TDApi\TDLibParameters();
    $tdlibParams
        ->setParameter(TDApi\TDLibParameters::USE_TEST_DC, true)
        ->setParameter(TDApi\TDLibParameters::DATABASE_DIRECTORY, '/var/tmp/tdlib')
        ->setParameter(TDApi\TDLibParameters::FILES_DIRECTORY, '/var/tmp/tdlib')
        ->setParameter(TDApi\TDLibParameters::USE_FILE_DATABASE, false)
        ->setParameter(TDApi\TDLibParameters::USE_CHAT_INFO_DATABASE, false)
        ->setParameter(TDApi\TDLibParameters::USE_MESSAGE_DATABASE, false)
        ->setParameter(TDApi\TDLibParameters::USE_SECRET_CHATS, false)
        ->setParameter(TDApi\TDLibParameters::API_ID, $api_id)
        ->setParameter(TDApi\TDLibParameters::API_HASH, $api_hash)
        ->setParameter(TDApi\TDLibParameters::SYSTEM_LANGUAGE_CODE, 'en')
        ->setParameter(TDApi\TDLibParameters::DEVICE_MODEL, php_uname('s'))
        ->setParameter(TDApi\TDLibParameters::SYSTEM_VERSION, php_uname('v'))
        ->setParameter(TDApi\TDLibParameters::APPLICATION_VERSION, '0.0.10')
        ->setParameter(TDApi\TDLibParameters::ENABLE_STORAGE_OPTIMIZER, true)
        ->setParameter(TDApi\TDLibParameters::IGNORE_FILE_NAMES, false);
    $result = $client->setTdlibParameters($tdlibParams);
    $result = $client->setDatabaseEncryptionKey(); // checkDatabaseEncryptionKey(key) or DESTROY

    $result = $client->setAuthenticationPhoneNumber($phone_number, 3); // wait response 3 seconds. default - 1.
    // UNCOMMENT NEXT and COMMENT PREVIOUS LINES WHEN RECEIVE SMS. Set your data
    // $result = $client->query(json_encode(['@type' => 'checkAuthenticationCode', 'code' => 'xxxxx', 'first_name' => 'dummy', 'last_name' => 'dummy']), 10);

    $result = $client->getAuthorizationState();
    $result = $client->query(json_encode(['@type' => 'searchPublicChat', 'username' => 'telegram']), 10);
    var_dump($result);

    $allNotifications = $client->getReceivedResponses();
    var_dump($allNotifications);
} catch (\Exception $exception) {
    echo sprintf('something goes wrong: %s', $exception->getMessage());
}
 ?>