## save ##### *Description* Performs a synchronous save. 同步执行写入到磁盘。 ##### *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="calibre16">$redis->save(); ```