pg_dbname

pg_dbname() returns the name of the database that the given PostgreSQL connection resource.

PostgreSQL database connection resource. When connection is not present, the default connection is used. The default connection is the last connection made by pg_connect() or pg_pconnect().

A string containing the name of the database the connection is to, or FALSE on error.

<?php
  error_reporting(E_ALL);

  pg_connect("host=localhost port=5432 dbname=mary");
  echo pg_dbname(); // mary
?>