PHP cal_info() 函数

cal_info(int $calendar = -1): array

// 获取所有可用日历的信息
$all_calendars = cal_info();
print_r($all_calendars);

Array
(
    [0] => Array
        (
            [months] => Array
                (
                    [1] => January
                    [2] => February
                    ...
                )
            [abbrevmonths] => Array
                (
                    [1] => Jan
                    [2] => Feb
                    ...
                )
            [maxdaysinmonth] => 31
            [calname] => Gregorian
            [calsymbol] => CAL_GREGORIAN
        )
    [1] => Array
        (
            // 其他日历信息...
        )
)

// 获取公历的详细信息
$gregorian_info = cal_info(CAL_GREGORIAN);
echo "日历名称: " . $gregorian_info['calname'] . "\n";
echo "月份最大天数: " . $gregorian_info['maxdaysinmonth'] . "\n";
echo "所有月份: " . implode(', ', $gregorian_info['months']) . "\n";
echo "月份缩写: " . implode(', ', $gregorian_info['abbrevmonths']);

日历名称: Gregorian
月份最大天数: 31
所有月份: January, February, March, April, May, June, July, August, September, October, November, December
月份缩写: Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec

// 获取犹太历的详细信息
$jewish_info = cal_info(CAL_JEWISH);
echo "日历名称: " . $jewish_info['calname'] . "\n";
echo "月份最大天数: " . $jewish_info['maxdaysinmonth'] . "\n";
echo "所有月份: " . implode(', ', $jewish_info['months']);

日历名称: Jewish
月份最大天数: 30
所有月份: Tishri, Heshvan, Kislev, Tevet, Shevat, Adar, Adar I, Adar II, Nisan, Iyyar, Sivan, Tammuz, Av, Elul

// 使用cal_info构建月份选择下拉菜单
$calendar_info = cal_info(CAL_GREGORIAN);
echo "<select name='month'>\n";
foreach ($calendar_info['months'] as $month_num => $month_name) {
    echo "<option value='{$month_num}'>{$month_name}</option>\n";
}
echo "</select>";

<select name='month'>
<option value='1'>January</option>
<option value='2'>February</option>
<option value='3'>March</option>
...
</select>