Imap::searchByHeader

public function searchByHeader($uid, $mailbox, array $header, &$error)
{
	$error = null;

	if (!$this->select($mailbox, $error))
	{
		return false;
	}

	if (empty($header))
	{
		return false;
	}

	$result = array();

	$response = $this->executeCommand(
		$ccc = sprintf(
			'%sSEARCH %s', $uid ? 'UID ' : '',
			join(
				' ',
				array_map(
					function ($name, $value)
					{
						return sprintf(
							'HEADER %s %s',
							static::prepareString($name),
							static::prepareString($value)
						);
					},
					array_keys($header),
					array_values($header)
				)
			)
		),
		$error
	);

	if ($error)
	{
		$error = $error == Imap::ERR_COMMAND_REJECTED ? null : $error;
		$error = $this->errorMessage(array(Imap::ERR_SEARCH, $error), $response);

		return false;
	}

	$regex = '/^ * x20 SEARCH x20 ( .+ ) rn $ /ix';
	foreach ($this->getUntagged($regex, true) as $item)
	{
		$result = preg_match_all('/d+/', $item[1][1]);
	}

	return $result;
}