EventCompareManager::compareHandler

private function compareHandler(): void
{
	foreach ($this->getCompareFields() as $field)
	{
		if (($this->eventValueForCompare[$field] ?? null) != ($this->originalValueForCompare[$field] ?? null))
		{
			$this->differenceFields[$field] = $this->eventValueForCompare[$field] ?? null;
		}
	}
}