判断当天是当月的第几周

public function get_week_num(){
        $time = strtotime('2022-05-01');
        $wk_day = date('w', strtotime(date('Y-m-1 00:00:00', $time))) ? : 7; //今天周几
        $day = date('d', $time) - (8 - $wk_day); //今天几号
        echo $day <= 0 ? 1 : ceil($day / 7) + 1; //计算是第几个星期
        die;
    }