做个记录周次计算,跨月根据天数占有的多少来判断应归为那个月的周次

实现功能如图：
A16D5FDF-AB5C-400F-BDE4-01C4AD04D427.png

代码如下：

public static function queryForAFewWeeks($lastMonday)
    {
        // 本月第一周的天数
        $firstWeekDay = 0;
        // 本月总天数
        $monthDays = date('t', $lastMonday);
        for ($i = 1; $i <= 7; $i++) {
            $day      = strtotime(date('Y-m-0' . $i, $lastMonday));
            $isMonday = date("w", $day);
            if ($isMonday == self::MONDAY) {
                $firstWeekDay = date('d', strtotime(date('Y-m-0' . $i, $lastMonday)));
            }
        }
        $weekly     = (date('d', $lastMonday) - $firstWeekDay) / 7; // 4
        $weeklyDays = $monthDays - date('d', $lastMonday); // 2
        if ($weeklyDays > 3) {
            $weekly++;
            if ($firstWeekDay > 4) {
                $weekly++;
            }
        } else {
            return date('m', $lastMonday) + 1 . '月W1';
        }
        return date('m', $lastMonday) . '月W' . $weekly;
    }