php日期处理date()函数，昨天，明天

代码如下

date_default_timezone_set('PRC'); //默认时区 
echo "今天:",date("Y-m-d",time()),"&lt;br&gt;"; 
echo "昨天:",date("Y-m-d",strtotime("-1 day")), "&lt;br&gt;"; 
echo "明天:",date("Y-m-d",strtotime("+1 day")), "&lt;br&gt;"; 
echo "一周后:",date("Y-m-d",strtotime("+1 week")), "&lt;br&gt;"; 
echo "下个星期四:",date("Y-m-d",strtotime("next Thursday")), "&lt;br&gt;"; 
echo "上个周一:".date("Y-m-d",strtotime("last Monday"))."&lt;br&gt;"; 
echo "一个月前:".date("Y-m-d",strtotime("last month"))."&lt;br&gt;"; 
echo "一个月后:".date("Y-m-d",strtotime("+1 month"))."&lt;br&gt;"; 
echo "十年后:".date("Y-m-d",strtotime("+10 year"))."&lt;br&gt;";

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