Save woocommerce order fields in uppercase
add_filter('woocommerce_checkout_posted_data', 'my_custom_woocommerce_checkout_posted_data'); function my_custom_woocommerce_checkout_posted_data($data){ if($data['billing_first_name']){ $data['billing_first_name'] = strtoupper($data['billing_first_name']); } if($data['billing_last_name']){ $data['billing_last_name'] = strtoupper($data['billing_last_name']); } //shipping fields too if($data['shipping_first_name']){ $data['shipping_first_name'] = strtoupper($data['shipping_first_name']); } if($data['shipping_last_name']){ $data['shipping_last_name'] = strtoupper($data['shipping_last_name']); } return $data; }