Description:
------------
Method character_set_name() is undefined but procedural style works fine.

PHP 5.1.0RC4-dev 
MySQL client - 4.1.14


Reproduce code:
---------------
// procedural style (works fine)
$conn = mysqli_connect($db_host, $db_user, $db_pass, $db_name);
var_dump(mysqli_client_encoding($conn));
var_dump(mysqli_character_set_name($conn));
mysqli_close($conn);
// oop style - got error
$conn = new mysqli($db_host, $db_user, $db_pass, $db_name);
var_dump($conn->client_encoding());
var_dump($conn->character_set_name());
$conn->close();     


Expected result:
----------------
string(17) "latin1_swedish_ci"
string(17) "latin1_swedish_ci"
string(17) "latin1_swedish_ci"
string(17) "latin1_swedish_ci"

Actual result:
--------------
string(17) "latin1_swedish_ci"
string(17) "latin1_swedish_ci"
string(17) "latin1_swedish_ci"

Fatal error: Call to undefined method mysqli::character_set_name() in C:\usr\mysqli\a.php on line 9