EtherpadLite\Client::__construct PHP Метод

    public function __construct($apiKey, $baseUrl = null)
    {
        if (strlen($apiKey) < 1) {
            throw new \InvalidArgumentException("[{$apiKey}] is not a valid API key");
        }
        $this->apiKey = $apiKey;
        if (isset($baseUrl)) {
            $this->baseUrl = $baseUrl;
        }
        if (!filter_var($this->baseUrl, FILTER_VALIDATE_URL)) {
            throw new \InvalidArgumentException("[{$this->baseUrl}] is not a valid URL");
        }
    }