## getOption ##### *Description* Get client option. 取得客户端的选项 ##### *Parameters* *parameter name* ##### *Return value* Parameter value. ##### *Example* ``` <pre class="calibre9">$redis->getOption(Redis::OPT_SERIALIZER); // return Redis::SERIALIZER_NONE, Redis::SERIALIZER_PHP, or Redis::SERIALIZER_IGBINARY. ```