How to check if a session exists in PHP4?

To check if it exists, I do

$id = session_id();
if ($id == '') {... no session ...}

If the $id is empty, then there is no session.

But the problem is when I use the "session_id()" function from a different page than the page that contains the "session_start()" function, the returned $id is always empty.

Do have I to pass the SID in the url or something? Is there a setup file that I should update?

the concept is to not look for an existing session but to look for an existing session variable... try the following:

file page1.php
<BLOCKQUOTE><font size="1" face="Verdana,Arial,Helvetica">code:</font><HR><pre>
<?
session_start();
session_register("isregistered");
$isregistered = 1;
?>
<a href="page2.php?<?=SID?>">click here</a>
[/code]

file page2.php
<BLOCKQUOTE><font size="1" face="Verdana,Arial,Helvetica">code:</font><HR><pre>
<?
session_start();
if(session_is_registered("isregistered")){echo "THE SESSION EXISTS !!!";}
else{echo "NO SESSION, BOO HOO";}
?>
[/code]

hope that helps

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I just forgot to use the session_start() function. Now things work wonders!
Thanks!