## bgsave ##### *Description* Performs a background save. 异步保存到磁盘。 ##### *Parameters* None. ##### *Return value* *BOOL*: `<span class="calibre12">TRUE</span>` in case of success, `<span class="calibre12">FALSE</span>` in case of failure. If a save is already running, this command will fail and return `<span class="calibre12">FALSE</span>`. ##### *Example* ``` <pre class="calibre9">$redis->bgSave(); ``` ##