[dokuwiki] $_SESSION and DokuWiki debugging

Hello,

while integrating DokuWiki with internal portal, I need to debug some
interactions. I wanted to use die() in DokuWiki code whenever
$_SESSION['HAPPY_DEBUG'] is set, which would serve as a debug
indicator flag. (A separate php script is used to set/unset
$_SESSION['HAPPY_DEBUG'].)

It looks that DokuWiki never has $_SESSION['HAPPY_DEBUG'] set. Does it
filter out custom entries in $_SESSION? If so, what's the easier way
to 'debug' DokuWiki - i.e. to trace pageflow and control flow, so that
one could figure out the interactions?

Thank you for DokuWiki.

- Peter Kehl
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