怎样用php实现两个时间相减，得到相差的天数

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<?php
$time1 = mktime(10,20,30,2,5,2000); //2000-2-5 10:20:30
$time2 = mktime(18,30,20,5,2,2000); //2000-5-2 18:30:20
$diff = (int)(($time2-$time1)/(24*3600));
echo "$time2 和 $time1 的时间差为：" . $diff . "天<br>";
?>