> After creating a new session with session_start() and 
> inserting a few values
> e.g $HTTP_SESSION_VARS['foo'] = 'bar'; a file 
> /tmp/sess_{session_id} is
> created.
> The problem is that this file is empty! 0 bytes. no data is stored.
> I'm using php 4.0.6 on linux with apache 1.3 something.

Check the register_globals setting in php.ini. If it is set to "On", then
code like this:

$foo = 'bar';
echo $foo;

If register_globals is set to "Off", then code as you are already doing:

$HTTP_SESSION_VARS['foo'] = 'bar';
echo {$HTTP_SESSION_VARS['foo']};


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