Added some comments

app.php

@@ -20,7 +20,7 @@ bind_textdomain_codeset($domain, 'UTF-8');
 textdomain($domain);
 
 /*
- * Config
+ * Load configs
  */
 
 $config = load_config('config.json');
@@ -33,23 +33,27 @@ if (isset($config['default_timezone']))
 
 define('ROOT_URL', $config['root_url']);
 
+/*
+ * Set up app with custom Latte view
+ */
+
 $view = new Slim\Latte\LatteView(array(
     'path' => __DIR__ . '/templates',
     'cache' => __DIR__ . '/.cache/latte',
     'configure_engine' => function ($engine) {
+        // support for {_'...'} syntax in latte templates
         $engine->addFilter('translate', function($s) {
             return gettext($s);
         });
 
+        // install {form} macro's from Bootstrap form renderer
         $engine->onCompile[] = function ($latte) {
             $compiler = $latte->getCompiler();
             Instante\Bootstrap3Renderer\Latte\FormMacros::install($compiler);
         };
     }
 ));
-$app = new Slim\Slim(array(
-    'view' => $view
-));
+$app = new Slim\Slim(compact('view'));
 
 /*
  * Database setup