function updateSlidesOrderCallback() { mpslVerifyNonce(); if (isset($_POST['order'])) { $order = (array) $_POST['order']; $db = new MPSliderDB(); $result = $db->updateSlidesOrder($order); if (false !== $result) { wp_send_json(array('result' => true)); } else { global $wpdb; mpslSetError(__('Slides order update error: ' . $wpdb->last_error, MPSL_TEXTDOMAIN)); } } else { mpslSetError(__('Order is not set.', MPSL_TEXTDOMAIN)); } die; }