better naming $db variable

public/index.php

@@ -94,13 +94,13 @@ $app->map(['GET', 'POST'], '/blog/create', function (Request $request, Response
             addFooter($response);
         } else {
             $data = $request->getParsedBody();
-            $db = new Blog();
+            $blog = new Blog();
 
-            $res = $db->createBlog($data);
+            $res = $blog->createBlog($data);
             if ($res) {
                 return $response->withHeader('Location', '/')->withStatus(302);
             } else {
-                $err = $db->lastErrorMsg();
+                $err = $blog->lastErrorMsg();
                 $_SESSION['error'] = $err;
                 return $response->withHeader('Location', '/blog/create')->withStatus(302);
             }
@@ -148,8 +148,8 @@ $app->map(['GET', 'POST'], '/login', function (Request $request, Response $respo
     } else {
         $postdata = $request->getParsedBody();
 
-        $db = new User();
-        $logged_in = $db->checkUserPass($postdata['username'], $postdata['password']);
+        $user = new User();
+        $logged_in = $user->checkUserPass($postdata['username'], $postdata['password']);
         if ($logged_in) {
             //if ($postdata['username'] == 'gebruiker' && $postdata['password'] == "abcd") {
             $_SESSION["username"] = $postdata['username'];