Description:
------------
The mysql_field_name API should return FALSE on errror,
that is what the docs state, but the impl returns NULL.

Here is what the current code returns:

mysql_field_name($res):
Warning: Wrong parameter count for mysql_field_name() in C:\caucho_dev\trunk\qa\php\f.qa on line 11
NULL

Reproduce code:
---------------
<php out='stdout'>
<?php

mysql_connect("localhost", "", "");
mysql_query("USE test");
$res = mysql_query("SELECT * FROM test WHERE id = 1");

echo 'mysql_field_name($res): ';
var_dump(mysql_field_name($res));

?>
</php>

Expected result:
----------------
Should return FALSE.