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According to the document of PHP official website, http://php.net/sys_getloadavg

sys_getloadavg

(PHP 5 >= 5.1.3)

sys_getloadavg — Gets system load average

So, it’s only for PHP >= 5.1.3. In PHP < 5.1.3, we use this function below:

<?php

if (!function_exists(‘sys_getloadavg’)) {

    function sys_getloadavg()
    {
        if (@is_readable(‘/proc/loadavg’)) { //Linux
            if ($fh = @fopen(‘/proc/loadavg’, ‘r’)) {
                $data = @fread($fh, 6);
                @fclose($fh);
                $load_avg = explode(" ", $data);

            }
        } else { //Freebsd
            if ($serverstats = @shell_exec("uptime")) {
                $str = substr(strrchr($serverstats, ":"), 1);
                $load_avg = array_map("trim", explode(",", $str));
            }
        }
        return $load_avg ? $load_avg : array(0, 0, 0);

    }

}

?>

Note: This function is not implemented on Windows platforms.

Example of that function: sys_getloadavg

<? var_dump(sys_getloadavg()); ?>

With Windows platforms, we use this function below to get 1 minute load average:

function win_getloadavg()
{
    $wmi = new COM("Winmgmts://");
    $server = $wmi->execquery("SELECT LoadPercentage FROM Win32_Processor");

    $cpu_num = 0;
    $load_total = 0;

    foreach ($server as $cpu) {
        $cpu_num++;
        $load_total += $cpu->loadpercentage;
    }

    $load = round($load_total / $cpu_num);

    return (int)$load;

}

To check operation system Windows, you use that code:

if (stristr(PHP_OS, 'win')) {
    //Your code
}