RedisConnectionConfigurator::addServers

protected function addServers($config)
{
	$servers = $config['servers'] ?? [];

	if (empty($servers) && isset($config['host'], $config['port']))
	{
		array_unshift($servers, [
			'host' => $config['host'],
			'port' => $config['port'],
		]);
	}

	foreach ($servers as $server)
	{
		$this->servers[] = [
			'host' => $server['host'] ?? 'localhost',
			'port' => $server['port'] ?? '6379',
		];
	}

	return $this;
}