HM\BackUpWordPress\Plugin::generate_key PHP Method

    protected function generate_key()
    {
        $check = apply_filters('hmbkp_generate_key', null);
        if (null !== $check) {
            return $check;
        }
        $key = array(ABSPATH, time());
        $constants = array('AUTH_KEY', 'SECURE_AUTH_KEY', 'LOGGED_IN_KEY', 'NONCE_KEY', 'AUTH_SALT', 'SECURE_AUTH_SALT', 'LOGGED_IN_SALT', 'NONCE_SALT', 'SECRET_KEY');
        foreach ($constants as $constant) {
            if (defined($constant)) {
                $key[] = constant($constant);
            }
        }
        shuffle($key);
        return md5(serialize($key));
    }