MessageFolder::getFolderNameByHash

static function getFolderNameByHash($messageFolderHash, $mailboxOptions)
{
	$folderName = '';
	if (!empty($mailboxOptions['imap']['dirsMd5']))
	{
		$names = array_filter(
			$mailboxOptions['imap']['dirsMd5'],
			function ($hash) use ($messageFolderHash)
			{
				return $hash == $messageFolderHash;
			}
		);
		if (count($names) == 1)
		{
			$folderName = array_keys($names)[0];
		}
	}
	return $folderName;
}