raspap-webgui/app/lib/system.php

<?php

class System {
    public function hostname() {
        return shell_exec("hostname -f");
    }

    public function uptime() {
        $uparray = explode(" ", exec("cat /proc/uptime"));
        $seconds = round($uparray[0], 0);
        $minutes = $seconds / 60;
        $hours   = $minutes / 60;
        $days    = floor($hours / 24);
        $hours   = floor($hours   - ($days * 24));
        $minutes = floor($minutes - ($days * 24 * 60) - ($hours * 60));
        $uptime= '';
        if ($days    != 0) {
            $uptime .= $days    . ' day'    . (($days    > 1)? 's ':' ');
        }
        if ($hours   != 0) {
            $uptime .= $hours   . ' hour'   . (($hours   > 1)? 's ':' ');
        }
        if ($minutes != 0) {
            $uptime .= $minutes . ' minute' . (($minutes > 1)? 's ':' ');
        }

        return $uptime;
    }

    public function usedMemory() {
        $used = shell_exec("free -m | awk '/Mem:/ { total=$2 ; used=$3 } END { print used/total*100}'");
        return floor($used);
    }

    public function processorCount() {
        $procs = shell_exec("nproc --all");
        return intval($procs);
    }

    public function loadAvg1Min() {
        $load = exec("awk '{print $1}' /proc/loadavg");
        return floatval($load);
    }

    public function systemLoadPercentage() {
        return intval(($this->loadAvg1Min() * 100) / $this->processorCount());
    }

    public function systemTemperature() {
        $cpuTemp = file_get_contents("/sys/class/thermal/thermal_zone0/temp");
        return number_format((float)$cpuTemp/1000, 1);
    }

    public function hostapdStatus() {
        exec('pidof hostapd | wc -l', $status);
        return $status;
    }

}