PHP中strtotime的妙用——计算昨天、前天、上个星期的时间……

不用说太多，看代码和运行结果就明白

<?php
    echo strtotime("now"), "</b><br/>";
    echo strtotime("1999-12-31 23:59:59"), "</b><br/>";
    echo strtotime("+1 day"), "</b><br/>";
    echo strtotime("+1 week"), "</b><br/>";
    echo strtotime("+1 week 2 days 4 hours 2 seconds"), "</b><br/>";
    echo strtotime("next Thursday"), "</b><br/>";
    echo strtotime("last Monday"), "</b><br/>";
    
    echo "<h3>Saven Days ago1: ".strtotime(date("Y-m-d", strtotime("-7 day")))."</h3>";
    echo "<h3>Saven Days ago2: ".date("Y-m-d H:i:s", strtotime("-7 day"))."</h3>";
    echo "<h3>Saven Days ago3: ".date("Y-m-d H:i:s", strtotime(date("Y-m-d", strtotime("-7 day"))))."</h3>";
?>

输出结果：

1375945008
946655999
1376031408
1376549808
1376737010
1376496000
1375632000

Saven Days ago1: 1375286400

Saven Days ago2: 2013-08-01 14:56:48

Saven Days ago3: 2013-08-01 00:00:00