mbstring.php

<?php

$b = mb_get_info();
mb_language('Japanese');
$a = mb_get_info();
mb_language('Russian');
$c = mb_get_info();
mb_language('Traditional Chinese');
$d = mb_get_info();

var_dump(array_diff($a, $b));
var_dump(array_diff($c, $b));
var_dump(array_diff($d, $b));

/*
array(3) {
  ["mail_charset"]=>
  string(11) "ISO-2022-JP"
  ["mail_body_encoding"]=>
  string(4) "7bit"
  ["language"]=>
  string(8) "Japanese"
}
array(4) {
  ["mail_charset"]=>
  string(6) "KOI8-R"
  ["mail_header_encoding"]=>
  string(16) "Quoted-Printable"
  ["mail_body_encoding"]=>
  string(4) "8bit"
  ["language"]=>
  string(7) "Russian"
}
array(3) {
  ["mail_charset"]=>
  string(5) "BIG-5"
  ["mail_body_encoding"]=>
  string(4) "8bit"
  ["language"]=>
  string(19) "Traditional Chinese"
}
 */