PHP สามารถเขียนให้เปิดรอรับ SNMP Trap ที่อุปกรณ์ Cisco ส่งมาให้ผ่าน port 162 แบบ Real Time ได้รึป่าวครับ

<?php
    function getURLContents($url, $ip, $port, $ssl = false, $closeConnection = false)
    {
        if ($ssl)
            $ssl = 'ssl://';
        else
            $ssl = '';
        $fp = pfsockopen($ssl.$ip, $port, $errno, $errstr, MAX_TIME_TO_START_CONNECTION);
        if ($fp)
        {
            $out =  'GET '.$url." HTTP/1.1\r\n";
            $out .= 'Host: '.$ip.':'.$port."\r\n";
            if ($closeConnection)
                $out .= "Connection: close\r\n";
            else
                $out .= "Connection: keep-alive\r\n";
            $out .= "\r\n";
            if (!fwrite($fp, $out))
            {
                echo 'Problem writing to socket, opening a new connection.';
                fclose($fp);
                $fp = pfsockopen($ssl.$ip, $port, $errno, $errstr, MAX_TIME_TO_START_CONNECTION);
                fwrite($fp, $out);
            }
            $theData = '';
            $notDone = true;
            stream_set_blocking($fp, 0);
            $startTime = time();
            $lastTime = $startTime;
            while (!feof($fp) && !$done && (($startTime + MAX_TIME_FOR_THE_RESPONSE) > time()))
            {
                usleep(100);
                $theNewData = stream_get_line($fp, 1024, "\n");
                $theData .= $theNewData;
                $done = (trim($theNewData) === '0');

            }
        }
        else
        {
            echo 'ERROR CONNECTING TO '.$ip.':'.$port;
            return false;
        }
        if ($closeConnection)
            fclose($fp);
        return $theData;
    }
?>