Description:
------------
The mysql C API exposes a charset comment field (see http://dev.mysql.com/doc/refman/5.1/en/mysql-get-character-set-info.html) which exposes extra information on the character set.

The information is the same as in the "Description" result column returned by "SHOW CHARSET;"

IMHO the charset comment should be part of the mysqli_get_charset() result.

Adding this to "classic" ext/mysqli is easy but getting this into mysqlnd seems to be more tricky

Reproduce code:
---------------
<?php
$db = mysqli_init();
$db->real_connect("localhost", "root", "", "test");
var_dump($db->get_charset());
?>

Expected result:
----------------
object(stdClass)#2 (8) {
  ["charset"]=>
  string(6) "latin1"
  ["collation"]=>
  string(17) "latin1_swedish_ci"
  ["dir"]=>
  string(0) ""
  ["min_length"]=>
  int(1)
  ["max_length"]=>
  int(1)
  ["number"]=>
  int(8)
  ["state"]=>
  int(801)
  ["comment"]=>
  string(20) "cp1252 West European"
}


Actual result:
--------------
object(stdClass)#2 (8) {
  ["charset"]=>
  string(6) "latin1"
  ["collation"]=>
  string(17) "latin1_swedish_ci"
  ["dir"]=>
  string(0) ""
  ["min_length"]=>
  int(1)
  ["max_length"]=>
  int(1)
  ["number"]=>
  int(8)
  ["state"]=>
  int(801)
}