Allow backticks in order by

MysqliDb.php

@@ -469,14 +469,14 @@ class MysqliDb
     {
         $allowedDirection = Array ("ASC", "DESC");
         $orderbyDirection = strtoupper (trim ($orderbyDirection));
-        $orderByField = preg_replace ("/[^-a-z0-9\.\(\),_]+/i",'', $orderByField);
+        $orderByField = preg_replace ("/[^-a-z0-9\.\(\),_`]+/i",'', $orderByField);
 
         if (empty($orderbyDirection) || !in_array ($orderbyDirection, $allowedDirection))
             die ('Wrong order direction: '.$orderbyDirection);
 
         if (is_array ($customFields)) {
             foreach ($customFields as $key => $value)
-                $customFields[$key] = preg_replace ("/[^-a-z0-9\.\(\),_]+/i",'', $value);
+                $customFields[$key] = preg_replace ("/[^-a-z0-9\.\(\),_`]+/i",'', $value);
 
             $orderByField = 'FIELD (' . $orderByField . ', "' . implode('","', $customFields) . '")';
         }

tests.php

@@ -157,12 +157,13 @@ $q = "drop table {$prefix}test;";
 $db->rawQuery($q);
 
 
-$db->orderBy("id","asc");
+$db->orderBy("`id`","asc");
 $users = $db->get("users");
 if ($db->count != 3) {
     echo "Invalid total insert count";
     exit;
 }
+echo $db->getLastQuery();
 
 // order by field
 $db->orderBy("login","asc", Array ("user3","user2","user1"));