<?php
session_start();
session_register ("count");

header ("Expires: Mon, 26 Jul 1997 05:00:00 GMT");    

$count++;
//session_write_close();
?>

If I don't put the session_write_close() call, I will end up getting an empty session file, and all the session data is lost.

Putting the call solves the problem, but this shouldn't happen at all.

Using Apache 1.3.22 with PHP 4.0.6 as a dynamic module.

---------------
session info as read from phpinfo()
----------------
session.auto_start Off Off 
session.cache_expire 180 180 
session.cache_limiter nocache nocache 
session.cookie_domain no value no value 
session.cookie_lifetime 0 0 
session.cookie_path / / 
session.cookie_secure Off Off 
session.entropy_file no value no value 
session.entropy_length 0 0 
session.gc_maxlifetime 1440 1440 
session.gc_probability 1 1 
session.name PHPSESSID PHPSESSID 
session.referer_check no value no value 
session.save_handler files files 
session.save_path /tmp /tmp 
session.serialize_handler php php 
session.use_cookies On On