PHP 获取给定时间的周日时间或月末时间或每天

//获取给定时间的周日时间或月末时间或每天
    private function endDate ($time, $type = 1, $openTime = '20:00:00')
    {
        if ($type == 1) {
            return date('Y-m-d ' . $openTime, $time);
        } elseif ($type == 2) {
            $w = strftime('%u', $time);//获取是周几的数字1-7
            return date('Y-m-d ' . $openTime, $time + (7 - $w) * 24 * 60 * 60);
        } elseif ($type == 3) {
            $t = date('t', $time);//获取给定日期月末是几号，数字
            return date('Y-m-' . $t . ' ' . $openTime, $time);
        }
        return '';
    }