Updated theme handling and got the category form to clone rows.

db/category.php

@@ -3,7 +3,7 @@
 
     function get_category_items()
     {
-        global $conn;
+        $conn = get_db_connection();
         $items = mysqli_query($conn, "SELECT * FROM `category`");       
         $conn->close();
 
@@ -12,7 +12,7 @@
 
     function create_category($name)
     {
-        global $conn;
+        $conn = get_db_connection();
         $statement = $conn->prepare("INSERT INTO `category` (category_name) VALUES (?)");
         $statement->bind_param("s", $name);
         if($statement->execute() == true){