Bandwidth consumption on digital ocean with vnstat

vnstat.php

<?php

// sudo apt-get install vnstat
// sudo vnstat -u -i eth0
// sudo vnstat -i eth0

$results = shell_exec("vnstat -m --oneline");
$resultsArray = explode("\n", trim($results));
$servidorArray = explode(";", $resultsArray[0]);
$data = $servidorArray[2];
$download = $servidorArray[3];
$upload = $servidorArray[4];

echo $results;
echo "<br>";
echo $data;
echo "<br>";
echo $download;
echo "<br>";
echo $upload;




?>