Automatically generate username based on user ID in WooCommerce

I’m working on a WooCommerce project where each user have an ID number. I would like to use the default WooCommerce username field for this user ID.

When creating an account, can I automatically generate an account username for the customer based on their user ID?

Example: User ID = 101, Auto generated Username = 101

Is it possible?

Any help would really be appreciated. Thanks!

Answer

First of all, make sure that the following option is checked via the WooCommerce settings

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Normally than you could use the woocommerce_new_customer_username filter hook to change the generated username.

Copied from includes/wc-user-functions.php

/**
 * Filter new customer username.
 *
 * @since 3.7.0
 * @param string $username      Customer username.
 * @param string $email         New customer email address.
 * @param array  $new_user_args Array of new user args, maybe including first and last names.
 * @param string $suffix        Append string to username to make it unique.
 */
return apply_filters( 'woocommerce_new_customer_username', $username, $email, $new_user_args, $suffix );

However, you want to determine the $username based on the $user_id, but the $user_id is determined after data such as username, email address, etc. has been added via wp_insert_user()

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So the solution is to update the $username based on the $user_id immediately after a user is registered, and this can be done via:

Copied from wp-includes/user.php (WordPress)

/**
 * Fires immediately after a new user is registered.
 *
 * @since 1.5.0
 *
 * @param int $user_id User ID.
 */
do_action( 'user_register', $user_id );

And

• wpdb – WordPress database access abstraction class.

• update_user_meta() – Update user meta field based on user ID.

---

So you get:

function action_user_register( $user_id ) {
    global $wpdb;
    
    // Set new name + nickname
    $new_name = 'something_' . $user_id;
    
    // Update user user_login
    $wpdb -> update( $wpdb -> users, 
        array( 'user_login' => $new_name, 'user_nicename' => $new_name, 'display_name' => $new_name ), 
        array( 'ID' => $user_id )
    );
    
    // Update user meta
    update_user_meta( $user_id, 'first_name', $new_name );
    update_user_meta( $user_id, 'nickname', $new_name );
} 
add_action( 'user_register', 'action_user_register', 10, 1 );

Note: Know that a customer/user can change some of these adjustments via his profile (my account), if you do not want this, you will have to make additional adjustments.