1. /** 
2. * 判断两日期是不是同一周 
3. * 星期是按周日到周六 
4. */ 
5. functiongetSameWeek($pretime,$aftertime){ 
6.     $flag= false;//默认不是同一周 
7.     $afweek=date('w',$aftertime);//当前是星期几 
8.     $mintime=$aftertime-$afweek* 3600*24;//一周开始时间 
9.     $maxtime=$aftertime+ (7-$afweek)*3600*24;//一周结束时间 
10.     if($pretime>=$mintime&&$pretime<=$maxtime){//同一周 
11.       $flag= true; 
12.     } 
13.     return$flag; 
14. } 
15. $testWeek_start=strtotime('2017-8-19'); 
16. $testWeek_end=strtotime('2017-8-23'); 
17. echogetSameWeek($testWeek_start,$testWeek_end)?'在同一周':'不在同一周'; 
18.  

出处：http://www.phpfensi.com/php/20180831/11096.html