The cubrid_ db_name function gets db name from results of cubrid_list_dbs().
string cubrid_db_name(resource $result, int $index)
<?php
error_reporting(E_ALL);
$conn = cubrid_connect('dbhost', 33000, 'demodb');
$db_list = cubrid_list_dbs($conn);
$i = 0;
$cnt = cubrid_num_rows($db_list);
while ($i < $cnt) {
echo cubrid_db_name($db_list, $i) . "\n";
$i++;
}
?>