Update file functions.php

include/functions.php

@@ -3,11 +3,11 @@ session_start();
 
 $role = isset($_SESSION['role']) ? (int)$_SESSION['role'] : 0;
 
-function nav($nav) {
+function nav($nav, $role) {
     foreach($nav as $name => $url) {
         echo "<a href='$url'><div class='navitem'>$name</div></a>";
     }
-    if($role >= 4) { 
+    if($_SESSION['role'] >= 4) { 
         echo "<a href='admin.php'><div class='navitem'>Admin</div></a>";
     }
     if (isset($_SESSION['userid'])) {