mysql_query - CREATE DATABASE

[R B <rbpphp@xxxxxxxxx>]

Hello,

When i create a mysql database with the next command:

mysql_query("CREATE DATABASE my_db",$con)

In the server is created the database, but usually the name is created with
a prefix.

In this case: someuser_my_db

How can i detect with PHP the complete name of the new database created?

Thanks