api2_query listdbs filter does not work

[Lupascu Rares]

this is the code i am using to find if there is a db called "testing" for the "x" account .. the pb is that everytime it lists all dbs for this account ... am i doing something wrong?

$xmlapi = new xmlapi($ip);
$xmlapi->hash_auth("root",$root_hash);
$xmlapi->set_output('array');
$xmlapi->set_debug(1);

echo '

';

$arrCheck = $xmlapi->api2_query("x", "MysqlFE", "listdbs", array("db"=>"testing"));

print_r($arrCheck);

die();

thanks,

Rares