[php smart class schedule] Select the day of the week in a certain date range and get the date corresponding to the day of the week

I recently used this in a curriculum project. There is a date range. After selecting the day of the week, I want to get the date corresponding to the selected week in this date range, as shown below, and the code is as follows

function getDateByWeek($data)
{    $start_date = strtotime($data['start_date']);    $end_date = strtotime($data['end_date']);    $days = ($end_date - $start_date) / 86400;    $weekArr = array('周日','周一','周二','周三','周四','周五','周六');    $newDate = array();    // 组建数组格式 $dataWeek['日期'] => 星期
    for ($i=0; $i < $days; $i++) { 
        $num_week = date('w',$start_date+($i*86400));        $dateWeek[date('Y-m-d',$start_date+($i*86400))] = $weekArr[$num_week];
    }    // 查找两个数组的交集，即获取提交的星期对应的日期
    $newDate=array_intersect($dateWeek,$data['items']);    // 获取数组中的键值(日期)，并组成一个新数组
    $date = array_keys($newDate);    return $date;
}

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