WooCommerce Force Numeric Usernames On Registration

Pre-Requisites

There are no pre-requisites in order for you to be able to implement this solution.

How To Implement This Solution?

Simply copy the pre-coded solution to your active theme’s functions.php or preferably the Code Snippets Plugin.

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About This Solution

This code snippet shows you how to make the registration form on the My Account page show an error is a user defined username is not numeric. This guide is particularly useful if you would like usernames to be an ID which already exists in the business.

/**
 * Snippet Name:	WooCommerce Force Numeric Usernames On Registration
 * Snippet Author:	ecommercehints.com
 */

add_action( 'woocommerce_register_post', 'ecommercehints_force_numeric_username', 10, 3 );
function ecommercehints_force_numeric_username( $username, $email, $errors ) {
	if ( !is_numeric($username) ) {
		$errors->add( 'numeric_username_error', 'Your username must be numeric only' );
	}
}