Simplistic TCP Monitor

tcp_monitor.php

<?php

error_reporting(0);

define('MONITOR_INTERVAL', 60);

$monitors = [
    ['127.0.0.1',25,80,110]
];

$loop = new React\EventLoop\LibEventLoop();

$loop->addPeriodicTimer(MONITOR_INTERVAL, function () use ($loop, $monitors) {
    foreach($monitors as $monitor){
        $host = array_shift($monitor);
        foreach($monitor as $service){
            $client = stream_socket_client('tcp://'.$host.':'.$service,$errno,$errstr,1);
            if($client){
                fclose($client);
            }
            else{
                echo 'IS SERVICE RUNNING? - '.$host.' '.$service.PHP_EOL;
            }
        }
    }
});

$loop->run();