Passing value from index.php to a TWIG file

Add tried using

<?php
$app->post('/', function (Request $request, Response $response, array $args){
  $body = $this->request->getParsedBody();
  $name = $body["name"];
  $email = $body["email"];
  $msg = $body["msg"];
  if(!empty($name) && !empty($email) && !empty($msg)){
    $cleanName = filter_var($name, FILTER_SANITIZE_STRING);
    $cleanEmail = filter_var($email, FILTER_SANITIZE_EMAIL);
    $cleanMsg = filter_var($msg, FILTER_SANITIZE_STRING);
  } 
  else {
    //  message the user that there was a problem
    $args['errName'] = "A field was empty";
    return $this->response->withStatus(301)->withHeader('Location', '/#contact');
  }
}
?>

to no avail.

However, this works:

<?php
$app->post('/', function (Request $request, Response $response, array $args){
  $body = $this->request->getParsedBody();
  $name = $body["name"];
  $email = $body["email"];
  $msg = $body["msg"];
  if(!empty($name) && !empty($email) && !empty($msg)){
    $cleanName = filter_var($name, FILTER_SANITIZE_STRING);
    $cleanEmail = filter_var($email, FILTER_SANITIZE_EMAIL);
    $cleanMsg = filter_var($msg, FILTER_SANITIZE_STRING);
  } 
  else {
    //  message the user that there was a problem
    $args['errName'] = "A field was empty";
    return $this->view->render($response, 'main.twig', $args);
  }
}
?>

But I'm sure this isn't best practices.

Perfect. Excellent. I'll give this a shot. Just what I was looking for. Thanks.

I was onto something when I came across this problem in Stackflow: http://stackoverflow.com/questions/871858/php-pass-variable-to-next-page

But I couldn't quite understand why my _SESSION variables would always display regardless of whether or not there was an error and whether or not I disabled them after rendering a Twig file in my browser. I think Flash messaging was indeed the key in its implementation of _SESSION. Interesting stuff. Thanks for the help.

Thanks for your help too, i think that's how junior and master developers work in real world, we can be proud of ourselves i think. Flash messages are used in Rails, PHP, Python, for logging, feedback and much more, i think they are very useful in all projects... Meet you in this forum again )

I continue to get this error when I try to echo messages[whatever] in my Twig file: Notice: Array to string conversion in C:\Apache24\htdocs\vendor\twig\twig\lib\Twig\Environment.php(403) : eval()'d code on line 115 Array

Line 115 refers to the cache. I was wondering how you configured your Twig-view and whether you set cache=>false, like I did.

I var_dump(message['success']), for example, and get the correct response. However, {{ success }} displays the error. This most likely means that my Twig configurations are faulty.

Okay, I figured out what my problem was, and it has nothing to do with my Twig configuration, but rather my understanding of what I was actually doing by creating something like:

$this->flash->addMessage('flash1', 'Your email was sent, thank you!');

I thought the 'flash1' was the key, and the 'Your email was sent, thank you.!' was the value, so I could access the value of 'flash1' with $message['flash1']. However, 'flash1' is actually an array, and the long string is the value of flash1[0]. So to echo that string I had to do this:

{{ flash1[0] }}

If I go: $this->flash->addMessage('flash1', 'Your email was sent, thank you!'); $this->flash->addMessage('flash1', 'Another message!');

Then I can echo these messages with {{ flash1[0] }} and {{ flash1[1] }}

Yes, you are right, could not answer to you, because was busy, but you figured this out ). I want to figure out, whether we can replace flash messages' keys from 0,1,2 to words, something like this:
$this->flash->addMessage('flash' - array, 'success' - key, 'abcde' - message). To make things like this:

{% if flash is not empty %}
    {% for key, msg in flash %}
      <h1> {{ key }} </h1>
      <h2> {{ msg }} </h2>
    {% endfor %}
  {% endif %}

Please do. I'd like to be able to pass $args through a redirect to my form of a single page website I'm constructing. I don't think this can be done with render().