pg_dbname returns the name of the database that the given PostgreSQL connection instance.
An PgSql\Connection instance. When connection is null, the default connection is used. The default connection is the last connection made by pg_connect or pg_pconnect.
As of PHP 8.1.0, using the default connection is deprecated.
A string containing the name of the database the connection is to.
|8.1.0||The connection parameter expects an PgSql\Connection instance now; previously, a resource was expected.|
|8.0.0||connection is now nullable.|