## setTimeout, expire, pexpire ##### *Description* Sets an expiration date (a timeout) on an item. pexpire requires a TTL in milliseconds. 給KEY設置一個生存周期，pexpire使用毫秒作為計算單位 ##### *Parameters* *Key*: key. The key that will disappear. Key:將被銷毀的KEY *Integer*: ttl. The key's remaining Time To Live, in seconds. integer:生命周期 ##### *Return value* *BOOL*: `<span class="calibre12">TRUE</span>` in case of success, `<span class="calibre12">FALSE</span>` in case of failure. ##### *Example* ``` <pre class="calibre9">$redis->set('x', '42'); $redis->setTimeout('x', 3); // x will disappear in 3 seconds. sleep(5); // wait 5 seconds $redis->get('x'); // will return `FALSE`, as 'x' has expired. ``` ##