php时间处理

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

//当前的时间增加5天

$date1 = "2018-12-21";

echo date('Y-m-d',strtotime("$date1 +5 day")); //输出结果：2018-12-26

//相应地,要增加月,年,将day改成month或year即可

//+++ 今天、昨天、明天 、上一周、下一周 +++++++++

echo "今天:",date("Y-m-d",time()),"<hr>";

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

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

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

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")), "<hr>";

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

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

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

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

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