How to Ping to a server to check whether it is up or down.

ping.php

<?php
/**
 * @param null $host
 * @param null $port
 * @param null $timeout
 * @return bool|string
 */
function PingToServer($host=null, $port=null, $timeout=null)
{
    if(empty($host) || empty($port) || empty($timeout)){
        return false;
    }
    $TimeStart = microtime(true);
    $Response = fSockOpen($host, $port, $errno, $errstr, $timeout);
    if (!$Response) { return "down"; }
    $TimeEnd = microtime(true);
    return round((($TimeEnd - $TimeStart) * 1000), 0)." ms";
}

//Echoing it will display the ping if the host is up, if not it'll say "down".
echo PingToServer("www.google.com", 80, 10);
?>