Description:
------------
pg_set_client_encoding('UTF-8') returns 0 but a call to pg_client_encoding() afterwards returns SQL_ASCII

The same code works on FreeBSD 6.2-RC1 and PHP 5.2.0 built against Postgresql 8.2

Reproduce code:
---------------
<?php
pg_connect('host=localhost dbname=db user=myuser password=mypass');
echo "pg_set_client_encoding: " . pg_set_client_encoding('UTF-8') . "\n";
$res = pg_query('SHOW client_encoding;');
echo "client_encoding: " . pg_fetch_object($res)->client_encoding . "\n";
echo "pg_client_encoding: " . pg_client_encoding();
?>

Expected result:
----------------
pg_set_client_encoding: 0
client_encoding: UTF-8
pg_client_encoding: UTF-8

Actual result:
--------------
pg_set_client_encoding: 0
client_encoding: UTF-8
pg_client_encoding: SQL_ASCII