/*** 判斷兩日期是不是同一周* 星期是按周日到周六*/function getSameWeek($pretime,$aftertime){    $flag = false;//默認不是同一周    $afweek = date('w',$aftertime);//當前是星期幾    $mintime = $aftertime - $afweek * 3600*24;//一周開始時間    $maxtime = $aftertime + (7-$afweek)*3600*24;//一周結束時間    if ( $pretime >= $mintime && $pretime <= $maxtime){//同一周      $flag = true;    }    return $flag;}$testWeek_start=strtotime('2017-8-19');$testWeek_end=strtotime('2017-8-23');echo getSameWeek($testWeek_start,$testWeek_end)?'在同一周':'不在同一周';