Imap::connect

public function connect(&$error)
{
	$error = null;

	if (!empty($this->sessState))
		return true;

	$resource = @stream_socket_client(
		$this->options['socket'], $errno, $errstr, $this->options['timeout'],
		STREAM_CLIENT_CONNECT, $this->options['context']
	);

	if ($resource === false)
	{
		$error = $this->errorMessage(Imap::ERR_CONNECT, $errno ?: null);
		return false;
	}

	$this->stream = $resource;

	if ($this->options['timeout'] > 0)
		stream_set_timeout($this->stream, $this->options['timeout']);

	$prompt = $this->readLine();

	if ($prompt !== false && preg_match('/^* (OK|PREAUTH)/i', $prompt, $matches))
	{
		if ($matches[1] == 'OK')
			$this->sessState = 'no_auth';
		elseif ($matches[1] == 'PREAUTH')
			$this->sessState = 'auth';
	}
	else
	{
		if ($prompt === false)
			$error = Imap::ERR_EMPTY_RESPONSE;
		elseif (preg_match('/^* BYE/i', $prompt))
			$error = Imap::ERR_REJECTED;
		else
			$error = Imap::ERR_BAD_SERVER;

		$error = $this->errorMessage(array(Imap::ERR_CONNECT, $error));

		return false;
	}

	if (!$this->capability($error))
		return false;

	if (!$this->options['tls'] && preg_match('/ x20 STARTTLS ( x20 | rn ) /ix', $this->sessCapability))
	{
		if (!$this->starttls($error))
			return false;
	}

	return true;
}