(PHP 4 >= 4.1.0, PHP 5, PHP 7, PHP 8)
cal_info — 返回选定历法的信息
$calendar = -1): array
cal_info() 返回选定 calendar 的信息。
以数组的形式返回历法信息，包含的元素有 calname（历法名称）、calsymbol（历法代码）、month
（月份）、abbrevmonth（月份的缩写）和 maxdaysinmonth（单月的最多天数）。calendar
参数可以使用下列值指定不同历法的名称：
CAL_GREGORIAN - 公历
CAL_JULIAN - 儒略历
CAL_JEWISH - 犹太历
CAL_FRENCH - 法国共和历
如果没有指定参数 calendar，所支持的所有历法将以数组形式返回。
calendar返回指定历法的信息，如果没有指定，将返回所有历法信息。
示例 #1 cal_info() 示例
<?php
$info = cal_info(0);
print_r($info);
?>以上示例会输出：
Array
(
[months] => Array
(
[1] => January
[2] => February
[3] => March
[4] => April
[5] => May
[6] => June
[7] => July
[8] => August
[9] => September
[10] => October
[11] => November
[12] => December
)
[abbrevmonths] => Array
(
[1] => Jan
[2] => Feb
[3] => Mar
[4] => Apr
[5] => May
[6] => Jun
[7] => Jul
[8] => Aug
[9] => Sep
[10] => Oct
[11] => Nov
[12] => Dec
)
[maxdaysinmonth] => 31
[calname] => Gregorian
[calsymbol] => CAL_GREGORIAN
)