## expireAt, pexpireAt ##### *Description* Sets an expiration date (a timestamp) on an item. pexpireAt requires a timestamp in milliseconds. 给一个KEY设置一个生命周期，单位是UNIX的时间戳。 ##### *Parameters* *Key*: key. The key that will disappear. Key:将被销毁的key *Integer*: Unix timestamp. The key's date of death, in seconds from Epoch time. integer:Unix 时间戳 ##### *Return value* *BOOL*: `<span class="calibre12">TRUE</span>` in case of success, `<span class="calibre12">FALSE</span>` in case of failure. ##### *Example* ``` <pre class="calibre16">$redis->set('x', '42'); $now = time(NULL); // current timestamp $redis->expireAt('x', $now + 3); // x will disappear in 3 seconds. sleep(5); // wait 5 seconds $redis->get('x'); // will return `FALSE`, as 'x' has expired. ``` ##