php如何在某个时间上加一天？一小时？时间加减-袁来如此的工作笔记

<?php

date_default_timezone_set('PRC'); //默认时区

echo "今天:",date("Y-m-d",time())," ";

echo "今天:",date("Y-m-d",strtotime("18 june 2008"))," ";

echo "昨天:",date("Y-m-d",strtotime("-1 day"))," ";

echo "明天:",date("Y-m-d",strtotime("+1 day"))," ";

echo "一周后:",date("Y-m-d",strtotime("+1 week"))," ";

echo "一周零两天四小时两秒后:",date("Y-m-d G:H:s",strtotime("+1 week 2 days 4 hours 2 seconds")), " ";

echo "下个星期四:",date("Y-m-d",strtotime("next Thursday"))," ";

echo "上个周一:".date("Y-m-d",strtotime("last Monday"))." ";

echo "一个月前:".date("Y-m-d",strtotime("last month"))." ";

echo "一个月后:".date("Y-m-d",strtotime("+1 month"))." ";

echo "十年后:".date("Y-m-d",strtotime("+10 year"))." ";

//strtotime可以接受第二个参数，类型timestamp,为指定日期

echo date('Y-m-d', strtotime ("+1 day", strtotime('2011-11-01'))),"\n";

<?php

echo "今天:",date('Y-m-d H:i:s')," ";//输出当前时间

echo "明天:",date('Y-m-d H:i:s',strtotime('+1 day'));//输出明天时间

//这里+1 day 可以修改参数1为任何想需要的数 day也可以改成year（年），month（月），hour（小时），minute（分），second（秒）

//如:

date('Y-m-d H:i:s',strtotime("+1 day +1 hour +1 minute");

php如何在某个时间上加一天？一小时？ 时间加减