(PHP 4, PHP 5)
pg_dbname — Get the database name
$connection
  ] )
   pg_dbname() returns the name of the database
   that the given PostgreSQL connection
   resource.
  
connection
     
       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.
  
Example #1 pg_dbname() example
<?php
  error_reporting(E_ALL);
  pg_connect("host=localhost port=5432 dbname=mary");
  echo pg_dbname(); // mary
?>