# Tidy Names and Postcodes Entered at Checkout

> Cleans up what customers type before the order is saved: names get proper capitals, postcodes become upper case and stray spaces are removed.

- Type: PHP
- Runs: Run everywhere
- Category: [WooCommerce](https://wpide.com/library/category/woocommerce/)
- Requires: WooCommerce
- Tags: woocommerce, checkout, data-quality, address
- Author: WPIDE Team
- Installs: 0
- Updated: 2026-10-28
- Page: https://wpide.com/library/woo-tidy-checkout-input/

## Code

```php
add_filter( 'woocommerce_checkout_posted_data', function ( $data ) {
    foreach ( array( 'billing', 'shipping' ) as $type ) {
        foreach ( array( 'first_name', 'last_name', 'city', 'address_1', 'address_2', 'company' ) as $field ) {
            $key = $type . '_' . $field;

            if ( empty( $data[ $key ] ) || ! is_string( $data[ $key ] ) ) {
                continue;
            }

            $value = trim( preg_replace( '/\s+/u', ' ', $data[ $key ] ) );

            if ( in_array( $field, array( 'first_name', 'last_name', 'city' ), true ) && ( mb_strtolower( $value ) === $value || mb_strtoupper( $value ) === $value ) ) {
                $value = mb_convert_case( mb_strtolower( $value ), MB_CASE_TITLE, 'UTF-8' );
            }

            $data[ $key ] = $value;
        }

        if ( ! empty( $data[ $type . '_postcode' ] ) && is_string( $data[ $type . '_postcode' ] ) ) {
            $data[ $type . '_postcode' ] = strtoupper( trim( preg_replace( '/\s+/', ' ', $data[ $type . '_postcode' ] ) ) );
        }
    }

    if ( ! empty( $data['billing_email'] ) && is_string( $data['billing_email'] ) ) {
        $data['billing_email'] = strtolower( trim( $data['billing_email'] ) );
    }

    return $data;
} );
```

## Notes

Names typed in mixed case, such as "McDonald", are left as typed; only all-lower or all-upper names are changed.

## How to use it

Install the free WPIDE plugin (https://wordpress.org/plugins/wpide/), find "Tidy Names and Postcodes Entered at Checkout" in its snippet library and add it in one click; or create a new PHP snippet in WPIDE (or any code snippets plugin) and paste the code above. More snippets: https://wpide.com/library/