php get the start date and end date of this week and last week_PHP tutorial

Recently, due to work needs, I use php to get the start date and end date of the current week and last week. I searched online and found nothing suitable, so I made a summary myself. The specific content and code are as follows.

<?php
header('Content-type: text/html; charset=utf-8');

$date=date('Y-m-d');  //当前日期

$first=1; //$first =1 表示每周星期一为开始日期 0表示每周日为开始日期

$w=date('w',strtotime($date));  //获取当前周的第几天 周日是 0 周一到周六是 1 - 6 

$now_start=date('Y-m-d',strtotime("$date -".($w ? $w - $first : 6).' days')); //获取本周开始日期，如果$w是0，则表示周日，减去 6 天

$now_end=date('Y-m-d',strtotime("$now_start +6 days"));  //本周结束日期

$last_start=date('Y-m-d',strtotime("$now_start - 7 days"));  //上周开始日期

$last_end=date('Y-m-d',strtotime("$now_start - 1 days"));  //上周结束日期

echo '本周开始日期：',$now_start,'<br />';
echo '本周结束日期：',$now_end,'<br />';
echo '上周开始日期：',$last_start,'<br />';
echo '上周结束日期：',$last_end,'<br />';

Note: Since the week in foreign countries always starts on Sunday, and in China, it is customary to start on Monday, so directly using strtotime("last monday") will give wrong results.

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