pg_host returns the host name of the given PostgreSQL connection instance is connected to.
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 host the connection is to, or an empty string on error.
|8.1.0||The connection parameter expects an PgSql\Connection instance now; previously, a resource was expected.|
|8.0.0||connection is now nullable.|