Here is a snippet that enables you to restrict certain usernames from being created by new users registering to your WordPress website.
Instructions
Add this code your theme function.php file.
*Remember to replace content of the “restricted array” with the usernames you want to restrict.
<?php
function wpsnippet_validate_username($valid, $username) {
$restricted = array('profile', 'directory', 'domain', 'download', 'downloads', 'edit', 'editor', 'email', 'ecommerce', 'forum', 'forums', 'favorite', 'feedback', 'follow', 'files', 'gadget', 'gadgets', 'games', 'guest', 'group', 'groups', 'homepage', 'hosting', 'hostname', 'httpd', 'https', 'information', 'image', 'images', 'index', 'invite', 'intranet', 'indice', 'iphone', 'javascript', 'knowledgebase', 'lists','websites', 'webmaster', 'workshop', 'yourname', 'yourusername', 'yoursite', 'yourdomain');
$pages = get_pages();
foreach ($pages as $page) {
$restricted[] = $page->post_name;
}
if(!$valid || is_user_logged_in() && current_user_can('create_users') ) return $valid;
$username = strtolower($username);
if ($valid && strpos( $username, ' ' ) !== false) $valid=false;
if ($valid && in_array( $username, $restricted )) $valid=false;
if ($valid && strlen($username) < 5) $valid=false;
return $valid;
}
add_filter('validate_username', 'wpsnippet_validate_username', 10, 2);
function wpsnippet_registration_errors($errors) {
if ( isset( $errors->errors['invalid_username'] ) )
$errors->errors['invalid_username'][0] = __( 'ERROR: Invalid username.', 'wpsnippet' );
return $errors;
}
add_filter('registration_errors', 'wpsnippet_registration_errors');
?>If you want to use a plugin to achieve the same functionality, you can use Scott Reilly’s Restrict Usernames WordPress plugin.
Hi,
Thanks for your code it seems to be what i need exept that i want to restrict the e-mail with specific term.
Im my case i don’t want user to create a account with the word “test” in their adress e-mail.
Is it possible by changing a bit the code you left ? my website is https://www.francbio.com/
Thanks for what you do
@charles, you can just add whatever term you wish to exclude, in the restricted array: $restricted = array(‘test”, ‘test’2’);
Be sure to remember to comma-separate all the terms, except for last one – or else you will get an error.