CLearnLesson::GetListOfParentPathes

static function GetListOfParentPathes ($lessonId, $breakOnLessonId = false, $breakBeforeLesson = false, $arIgnoreEdges = array())
{
	$arPathes = array(
		array($lessonId)
		);
	$arAlreadyProcessedLessons = array($lessonId);
	if ($breakOnLessonId !== false)
	{
		// This lesson must be interpreted as parentless.
		// This behaviour can be emulated by adding to
		// $arAlreadyProcessedLessons all immediate parents
		// of this lesson.
		$arEdges = self::ListImmediateParents($breakOnLessonId);
		foreach ($arEdges as $arEdge)
			$arAlreadyProcessedLessons[] = (int) $arEdge['PARENT_LESSON'];
	}

	if ($breakBeforeLesson !== false)
		$arAlreadyProcessedLessons[] = (int) $breakBeforeLesson;

	$arAllPathes = self::GetListOfParentPathesRecursive ($arPathes, $arAlreadyProcessedLessons, $arIgnoreEdges);

	$arObjPathes = array();
	foreach ($arAllPathes as $arPathBackward)
	{
		$arPath = array_reverse($arPathBackward);
		$o = new CLearnPath ($arPath);
		$o->PopBottom();		// remove $lessonId

		// skip empty pathes
		if ($o->Count() > 0)
			$arObjPathes[] = $o;
	}

	return ($arObjPathes);
}