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I am new in punbb and weak in php . I wanna know how to hide links from guest.

I know it must be somewhere in parser.php,
like
if ($pun_user["is_guest"])
return 'blabla';
else
return '<a href="'.$full_url.'">'.$link.'</a>';

But there are several return in parser.php

Which one or how to modify it.

thanks