Volt disable use of <?php ?>

Is there anyway to disable the use of "php" tags inside volt? I would like users to edit volt files, but to prevent them for injecting custom code into the file.. How would I achive this?

$di->set('view', function () {

            $view = new View();

            $view->setViewsDir('../../themes/default/production/v1.0.0/');

            $view->registerEngines([
                '.volt' => function ($view) {

                    $volt = new VoltEngine($view, $this);

                    $volt->setOptions([
                        'compiledPath' => '../../themes/default/production/v1.0.0/cache/',
                        'compiledSeparator' => '_',
                        'compileAlways' => true
                    ]);

                    $compiler = $volt->getCompiler();

                    $compiler->addExtension(
                        new PhpFunctionExtension()
                    );

                    return $volt;
                }
            ]);

            return $view;
        }, true);