Description:
------------
pg_close() and other pg_ functions unable to reference class variables as link resource. (Works with mysql_connect()) 

Reproduce code:
---------------
<?php
   class databasehandler0 
   {
        var foo;

        function connect() 
        {
                $this->foo = pg_connect('host=hostname dbname=database1 user=username1 password=pword1') || die ('An aweful death');
        }

        function disconnect()
        {
                pg_close($this->foo);
        }

   }
     
   $dbconn0 = new databasehandler0;
   $dbconn0->connect();
   $dbconn0->disconnect();
   
?>

Expected result:
----------------
I expect to be able to reference the class var foo in pg_close() as a resource connection.

Actual result:
--------------
Warning: pg_close(): supplied argument is not a valid PostgreSQL link resource