The $locale can although contain the information about the calendar
<?php
$traditionalFormatter = new IntlDateFormatter(
$locale.'@calendar='.$calendar,
IntlDateFormatter::SHORT,
IntlDateFormatter::SHORT,
'Europe/Berlin',
IntlDateFormatter::TRADITIONAL,
'yyyy/MM/dd HH:mm:ss' );
?>
To get the allowed values for $calendar, use the following code:
<?php
$bundle=new ResourceBundle('','ICUDATA');
$cnames=[];
$calendars=$bundle->get('calendar');
foreach($calendars as $n=>$v){
$cnames[]=$n;
}
echo (print_r($cnames,true));
?>
The result is:
Array
(
[0] => buddhist
[1] => chinese
[2] => coptic
[3] => dangi
[4] => default
[5] => ethiopic
[6] => ethiopic-amete-alem
[7] => gregorian
[8] => hebrew
[9] => indian
[10] => islamic
[11] => islamic-civil
[12] => japanese
[13] => persian
[14] => roc
)
