Ping Website on Mac/Linux with PHP

PHPping.php

<?php

class Ping {
    private $host;
    private $ttl;
    private $timeout;
    public  $commandOut;
    private $localhost = false;

    public function __construct($host, $ttl = 255, $timeout = 10) {
        if (!isset($host)) {
            throw new \Exception("Error: Host name not supplied.");
        }

        $this->host = $host;
        $this->ttl = $ttl;
        $this->timeout = $timeout;
    }

    public function pingDomain(){
        $latency    = false;
        $ttl        = escapeshellcmd($this->ttl);
        $timeout    = escapeshellcmd($this->timeout);
        $host       = escapeshellcmd($this->host);
        // for Mac OS
        if (strtoupper(PHP_OS) === 'DARWIN') {
            $exec_string = 'ping -n -c 1 -m ' . $ttl . ' -t ' . $timeout . ' ' . $host;
        } else {
            // for UNIX-based OS
            $exec_string = 'ping -n -c 1 -t ' . $ttl . ' -W ' . $timeout . ' ' . $host . ' 2>&1';
        }
        exec($exec_string, $output, $return);
        $this->commandOut = implode('', $output);
        $output = array_values(array_filter($output));

        if (!empty($output[1])) {
        // Search for a 'time' value in the result line.
        $response = preg_match("/time(?:=|<)(?<time>[\.0-9]+)(?:|\s)ms/", $output[1], $matches);

        // If there's a result and it's greater than 0, return the latency.
        if ($response > 0 && isset($matches['time'])) {
            $latency = round($matches['time'], 4);
        }
        }

        return $latency ." ms\n";
    }

    public function getCommandOut() {
        return $this->commandOut;
    }
}

// Implementation, $ php PHPping.php
$ping = new Ping('www.youtsite.com',225,10);
echo $ping->pingDomain();
echo $ping->getCommandOut(); // to see actual ping
// result: 15.03 ms