获取一个月的所有周的时间范围

//获取指定日期所在月的各个周的时间范围 第一周 1号至7号 以此类推
function getWeekByDate($date)
{
    $date = strtotime($date);
    //月初日期
    $start_time = mktime(0, 0, 0, date('m', $date), '01', date('Y', $date));
    //月末日期
    $end_day = strtotime('+1 month -1 days', $start_time);
    //第一周结束日期
    $end_time = strtotime('+6 days', $start_time);

    while ($end_time <= $end_day) {
        $data[]     = [
            'start_time' => date('Y-m-d', $start_time),
            'end_time'   => date('Y-m-d', $end_time)
        ];
        $start_time = strtotime('+1 days', $end_time);
        $end_time   = strtotime('+6 days', $start_time);
    }
    if ($start_time <= $end_day) {
        $end_time   = $end_day;
        $data[]     = [
            'start_time' => date('Y-m-d', $start_time),
            'end_time'   => date('Y-m-d', $end_time)
        ];
    }
    return $data;
}