Running on Apache 1.3.20 with PHP 4.0.6, no aditional modules loaded. The following script does NOT increment the $myvar variable and results in a new session file being created on every page view:

<?php

error_reporting(E_ALL);
session_start();
session_register('myvar');

if(!isset($myvar)) $myvar = 0;

echo $myvar++;

?>

The contents of EVERY session file created are as follows:

myvar|i:1;

The value is never incremented, and 0 is displayed on every page view.

register_globals = On
session.save_handler = files
session.save_path = D:\Inetpub\php\session
session.use_cookies = 1
session.name = PHPSESSID
session.auto_start = 0
session.cookie_lifetime = 0
session.cookie_path = /
session.cookie_domain = *.hotgazpacho.org
session.serialize_handler = php
session.gc_probability = 1
session.gc_maxlifetime = 1440
session.referer_check =
session.entropy_length = 0
session.entropy_file =
;session.entropy_length = 16
;session.entropy_file = /dev/urandom
session.cache_limiter = nocache
session.cache_expire = 180
session.use_trans_sid = 1
url_rewriter.tags = "a=href,area=href,frame=src,input=src,form=fakeentry"