pop3.class.php

    /**
     * Connect to a POP3 server.
     * @access public
     * @param string $host
     * @param integer|boolean $port
     * @param integer $tval
     * @return boolean
     */
    public function connect($host, $port = false, $tval = 30)
    {
        //  Are we already connected?
        if ($this->connected) {
            return true;
        }

        //On Windows this will raise a PHP Warning error if the hostname doesn't exist.
        //Rather than suppress it with @fsockopen, capture it cleanly instead
        set_error_handler(array($this, 'catchWarning'));

        if (false === $port) {
            $port = $this->POP3_PORT;
        }

        //  connect to the POP3 server
        $this->pop_conn = fsockopen(
            $host, //  POP3 Host
            $port, //  Port #
            $errno, //  Error Number
            $errstr, //  Error Message
            $tval
        ); //  Timeout (seconds)
        //  Restore the error handler
        restore_error_handler();

        //  Did we connect?
        if (false === $this->pop_conn) {
            //  It would appear not...
            $this->setError(array(
                'error' => "Failed to connect to server $host on port $port",
                'errno' => $errno,
                'errstr' => $errstr
            ));
            return false;
        }

        //  Increase the stream time-out
        stream_set_timeout($this->pop_conn, $tval, 0);

        //  Get the POP3 server response
        $response = $this->readResponse();
        strtok($response, '<');
        $this->_timestamp = strtok('>');
        if (!strpos($this->_timestamp, '@')) {
            $this->_timestamp = null;
        } else {
            $this->_timestamp = '<' . $this->_timestamp . '>';
        }

       /* if ($this->isTls) {
            $this->request('STLS');
            $result = stream_socket_enable_crypto($this->pop_conn, true, STREAM_CRYPTO_METHOD_TLS_CLIENT);
            if (!$result) {
                throw new RuntimeException('cannot enable TLS');
            }
        }*/

        //  The connection is established and the POP3 server is talking
        $this->connected = true;
        return true;
    }