sys_stat.php

<?php
ini_set('max_execution_time', 0);
ini_set('memory_limit', -1);

$host = '127.0.0.1';
$ports = array(80, 443, 3306);

$mem = @file_get_contents('/proc/meminfo');
$mem = preg_replace("/[[:blank:]]+/", " ", $mem);
$mem = str_replace(array("\r\n", "\n\r", "\r"), "\n", $mem);
$mem = explode("\n", $mem);

$mem_total  = explode(' ',$mem[0])[1];
$mem_free   = explode(' ',$mem[1])[1];
$mem_buffer = explode(' ',$mem[3])[1];
$mem_cached = explode(' ',$mem[4])[1];

//usage = total – free – buffers – cache
$mem_used = ($mem_total - $mem_free - $mem_buffer - $mem_cached);

$uptime = @file_get_contents('/proc/uptime');
$uptime = floatval($uptime);
$secs   = ceil(fmod($uptime, 60));  $uptime = intdiv($uptime, 60);
$mins   = $uptime % 60;             $uptime = intdiv($uptime, 60);
$hours  = $uptime % 24;             $uptime = intdiv($uptime, 24);
$days   = $uptime;

$data['cpu']      = sys_getloadavg()[0];
$data['mem_used'] = ceil($mem_used / $mem_total * 100);
$data['uptime']   = "$days days $hours:$mins:$secs";

foreach ($ports as $port)
{
    $connection = @fsockopen($host, $port, $errno, $errstr, 2);

    if (is_resource($connection)):
        fclose($connection);
        $status = TRUE;
    else:
        $status = FALSE;
    endif;

    $data['ports'][$port] = $status;
}

header('Content-Type: application/json');
echo json_encode($data);