## randomKey ##### *Description* Returns a random key. 返回一个随机的KEY。 ##### *Parameters* None. ##### *Return value* *STRING*: an existing key in redis. STRING：一个存在于REDIS中的KEY ##### *Example* ``` <pre class="calibre9">$key = $redis->randomKey(); $surprise = $redis->get($key); // who knows what's in there. ```