CommentPoster::prepareCrmElementChanges

private function prepareCrmElementChanges(array $values): array
{
	$collection = [];

	$oldElements = (explode(',', $values['FROM_VALUE']) ?: []);
	$newElements = (explode(',', $values['TO_VALUE']) ?: []);

	$uniqueElements = array_unique(array_merge($oldElements, $newElements));
	sort($uniqueElements);

	foreach ($uniqueElements as $element)
	{
		[$type, $id] = explode('_', $element);
		$typeId = CCrmOwnerType::ResolveID(CCrmOwnerTypeAbbr::ResolveName($type));
		$title = CCrmOwnerType::GetCaption($typeId, $id);
		$url = CCrmOwnerType::GetEntityShowPath($typeId, $id);

		if (!isset($collection[$type]))
		{
			$collection[$type] = [];
		}
		$title = ($title ?: $element);
		if ($title)
		{
			$title = htmlspecialcharsbx($title);
			$collection[$type][$element] = "{$title}";
		}
	}

	$result = [];
	$noValue = Loc::getMessage('COMMENT_POSTER_COMMENT_TASK_UPDATE_CHANGES_FIELD_VALUE_NO');

	foreach ($collection as $type => $typeElements)
	{
		$old = array_intersect_key($typeElements, array_flip($oldElements));
		$new = array_intersect_key($typeElements, array_flip($newElements));

		if (!array_diff_key($old, $new) && !array_diff_key($new, $old))
		{
			continue;
		}

		$result[$type] = [
			'OLD' => (empty($old) ? $noValue : implode(', ', $old)),
			'NEW' => (empty($new) ? $noValue : implode(', ', $new)),
		];
	}

	return $result;
}