think\cache\driver\Redis::__construct PHP Method

    public function __construct($options = [])
    {
        if (!extension_loaded('redis')) {
            throw new \BadFunctionCallException('not support: redis');
        }
        if (!empty($options)) {
            $this->options = array_merge($this->options, $options);
        }
        $func = $this->options['persistent'] ? 'pconnect' : 'connect';
        $this->handler = new \Redis();
        $this->handler->{$func}($this->options['host'], $this->options['port'], $this->options['timeout']);
        if ('' != $this->options['password']) {
            $this->handler->auth($this->options['password']);
        }
        if (0 != $this->options['select']) {
            $this->handler->select($this->options['select']);
        }
    }