Description:
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pg_last_notice() fails in very specific circumstances. The failure seems to happen under only a very specific set of circumstances.

- The $_SESSION superglobal is used to hold a db connection resource.
- There is an active session.
- The database connection is made in an included file.

Reproduce code:
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<? // filename - thisworks.php
session_start();
$_SESSION["dbconn"]=pg_connect("dbname=meridican user=postgres password=");
$result=pg_query($_SESSION["dbconn"],$sql);
echo pg_last_notice($_SESSION["dbconn"]); ?>

<? // filename - thisdoesntwork.php
session_start();
include("dbconn.php");
$result=pg_query($_SESSION["dbconn"],$sql);
echo pg_last_notice($_SESSION["dbconn"]); ?>

<? // filename - dbconn.php
$_SESSION["dbconn"]=pg_connect("dbname=meridican user=postgres password="); ?>


Expected result:
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In the example, the output from thisworks.php is the notice raised by postgres. The same result could be expected from the nearly identical code run in thisdoesntwork.php.

Actual result:
--------------
In actuality, thisdoesntwork.php outputs a blank.