flash messages

public/index.php

@@ -32,6 +32,8 @@ function addNavbar()
         ["link" => "https://www.facebook.com", "name" => "Facebook"],
         ["link" => "https://www.twiter.com", "name" => "Twitter"]
     ];
+    $err = ['type' => 'notice', 'text' => "we did it!"];
+    $twig->addMessage($err);
     $twig->addBlockVariable('navbar', ['urls' => $urls]);
 }
 
@@ -58,15 +60,12 @@ $app->get('/', function (Request $request, Response $response, array $args) {
     }
 
     $vars = [
-        "key" => "value",
-        'key2' => ["val1", "val2", "val3"],
-        "key3" => ["x1" => "y1", "x2" => "y2"],
-        "loggedIn" => isset($_SESSION['username']),
         "content" => "Dit is de main body met info"
-
     ];
 
     global $twig;
+    $err = ['type' => 'error', 'text' => "something's wrong"];
+    $twig->addMessage($err);
     $a =  $twig->render('index.html.twig', $vars);
     $response->getBody()->write($a);
     return $response;

src/View/Twig.php

@@ -15,7 +15,7 @@ class Twig
     {
         $loader = new FilesystemLoader($tmpl_folder);
         $this->twig = new Environment($loader, []);
-        $this->variables = ['navbar' => [], 'messages' => [], 'footer' => []];
+        $this->variables = ['navbar' => [], 'messages' => ['msgs' => []], 'footer' => []];
     }
 
     protected function load($tmpl)
@@ -23,6 +23,13 @@ class Twig
         return $this->twig->load($tmpl);
     }
 
+    public function addMessage($msg)
+    {
+        $current = $this->variables['messages']['msgs'];
+        $current[] = $msg;
+        $this->variables['messages']['msgs'] = $current;
+    }
+
     // add block variables to the global variable bag
     public function addBlockVariable($block, $data)
     {