Base::getDefaultFrom

public function getDefaultFrom()
{
	$fromList = $this->getFromList();
	$from = isset($fromList[0]) ? $fromList[0]['id'] : null;
	//Try to find alphanumeric from
	foreach ($fromList as $item)
	{
		if (!preg_match('#^[0-9]+$#', $item['id']))
		{
			$from = $item['id'];
			break;
		}
	}
	return $from;
}