[PHP] SID set or unset?

[Jean-Christian IMbeault]

Is the PHP constant SID always defined? I have found conflicting answer 
in the documentation. One page of the docs says it is always defined 
while another says it is defined only if the right cookie hasn't been 
passed to the server.

Also how can I check if the SID is set or not?

I have tried the following but get an error:

<?php
if (isset(SID)) {}
?>
Parse error: parse error, expecting `T_VARIABLE' or `'$''
Thanks,

Jean-Christian Imbeault

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