The cubrid_list_dbs function returns the name of every database existing in the server in array.
array cubrid_list_dbs (resource $conn_identifier)
<?php
$conn = cubrid_connect("localhost", 33088, "demodb");
$db_list = cubrid_list_dbs($conn);
var_dump($db_list);
cubrid_disconnect($conn);
?>
The above example will output:
array(1) {
[0]=>
string(6) "demodb"
}