## rPushx ##### Description Adds the string value to the tail (right) of the list if the ist exists. `<span class="calibre12">FALSE</span>` in case of Failure. 添加一个VALUE到LIST容器的底部（右侧）如果这个LIST存在的话。 ##### Parameters *key* *value* String, value to push in key ##### Return value *LONG* The new length of the list in case of success, `<span class="calibre12">FALSE</span>` in case of Failure. 如果ADD成功， 返回LIST容器最新的长度。失败则返回FALSE。 ##### Examples ``` <pre class="calibre9">$redis->delete('key1'); $redis->rPushx('key1', 'A'); // returns 0 $redis->rPush('key1', 'A'); // returns 1 $redis->rPushx('key1', 'B'); // returns 2 $redis->rPushx('key1', 'C'); // returns 3 /* key1 now points to the following list: [ 'A', 'B', 'C' ] */ ```