php获取所选日期周、月 开始结束时间

     

-------------------获取周起始日期-------------------------

 $time =所选日期时间戳 ;
        //获取当前周几

 $week = date('w', $time);
 if ($week==0) {
            $week=7;
 }
 $date = [];
 for ($i=1; $i<=7; $i++){
            $date[$i] = date($format ,strtotime( '+' . $i-$week .' days', $time));
 }
$starttime=$date[1] .' 00:00:00';
 $endtime=$date[7] .' 23:59:59';

-------------------获取月起始日期-------------------------

$timestamp = strtotime( $date );
$mdays = date( 't', $timestamp );//获取当前月份天数

$starttime = date( 'Y-m-01 00:00:00', $timestamp );
$endtime= date( 'Y-m-' . $mdays.' 23:59:59' , $timestamp );