MessageFolder::getFolderNameByType

static function getFolderNameByType($folderType, $mailboxOptions)
{
	if (!empty($mailboxOptions['imap']) && is_array($mailboxOptions['imap']))
	{
		$imapOptions = $mailboxOptions['imap'];
		if (!empty($imapOptions[$folderType]) && isset($imapOptions[$folderType][0]))
		{
			return $imapOptions[$folderType][0];
		}
	}
	return null;
}