How to remove copy-paste in Slim Framework with the same code in different routers?

Question

PHP

In some routers there is a need to define the variable $args['projectFolder']=...
Instead of copy-paste, I want to define a function "for each router", where variables that are used in more than one router will be defined. How to implement it?
If it is unclear explained, then here is the example of the code
Before:

$app->get('/[upload]', function ($request, $response, $args) {
    $args['projectFolder']=$this->settings['projectFolder'];
    return $this->view->render($response, 'upload.html', $args);
})->setName('main');

$app->get('/show_file/{id}', function ($request, $response, $args){
    $args['projectFolder']=$this->settings['projectFolder'];
     ......
    $args['fileUri']= $fileUri;
    return $this->view->render($response, 'show_file.html', $args);
})->setName('show_file');

After:

UnknownSuperfunction(){
    $args['projectFolder']=$this->settings['projectFolder'];
});


$app->get('/[upload]', function ($request, $response, $args) {
    return $this->view->render($response, 'upload.html', $args);
})->setName('main');

$app->get('/show_file/{id}', function ($request, $response, $args){
     ......
    $args['fileUri']= $fileUri;
    return $this->view->render($response, 'show_file.html', $args);
})->setName('show_file');

Answer 1

Option 1

init_vars(){
    $vars['x']='hello';
    return $vars;
});

$app->get('/[upload]', function ($request, $response, $args) {
    $vars= init_vars();
    return $this->view->render($response, 'upload.html', $args);
})->setName('main');

$app->get('/show_file/{id}', function ($request, $response, $args){
    $vars= init_vars();
    $args['fileUri']= $fileUri;
    return $this->view->render($response, 'show_file.html', $args);
})->setName('show_file');

Option 2

$vars['x']='hello';

$app->get('/[upload]', function ($request, $response, $args) use ($vars) {
    $x = $vars['x'];
    return $this->view->render($response, 'upload.html', $args);
})->setName('main');

$app->get('/show_file/{id}', function ($request, $response, $args) use ($vars){
    $x = $vars['x'];
    $args['fileUri']= $fileUri;
    return $this->view->render($response, 'show_file.html', $args);
})->setName('show_file');