Script that should run regularly to check the status of the internet and writes the results to a date stamped CSV.

uptime.php

<?php

date_default_timezone_set('Africa/Johannesburg');

/**
 * Get this library here https://github.com/geerlingguy/Ping
 */
require_once __DIR__ .'/Ping/JJG/Ping.php';

$lock = __DIR__ ."/.lock";

$logfile = __DIR__ ."/data/".date('Y-m-d').".csv";

$hosts = array(
    'google' => 'www.google.com',
    // Add more hosts here
);

if (is_file($lock)) {
    exit(1);
}

touch($lock);

if (!is_file($logfile)) {
    $headHandle = fopen($logfile, 'w+');
    fwrite($headHandle, "time,host,success,latency\n");
    fclose($headHandle);
}

$handle = fopen($logfile, 'a');

$p = new JJG\Ping('localhost');

foreach ($hosts as $host => $url) {
    $p->setHost($url);
    $latency = $p->ping();
    $line = [
        date('H:i'),
        $host,
        ($latency === false?'0':'1'),
        "{$latency} ms",
    ];
    fwrite($handle, implode(',', $line)."\n");
}

unlink($lock);
fclose($handle);