PHP 时间转换Unix时间戳代码

代码如下:
<?php
date_default_timezone_set('Asia/Chongqing');
$time1 = "2006-04-16 08:40:54";
$time2 = strtotime($time1);
echo $time2;
echo date('Y-m-d h:i:s',$time2);
?>