For example: process_course_section_tag() has code like:

unset($course);

// And then later...

if (preg_match('{<sourcedid>.*?<source>(.+?)</source>.*?</sourcedid>}is', $tagcontents, $matches)) {

    $course->sourcedidsource = trim($matches[1]);

}

$course should be initialized with $course = new stdClass;

Opening this file with an IDE like Netbeans or PhpStorm will help to identify all of these. There are around 11 give or take a few.

The ones like the above aren't too bad, but inside email_luminis_error() there are several that are undefined that might break emailing. These are undefined:

• $user
• $from
• $usetrueaddress
• $replytoname