WordPress 禁止用户注册某些用户名

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/**
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 * WordPress 禁止用户注册某些用户名
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 * https://www.wpdaxue.com/wordPress-username-restrictions.html
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 */
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function sozot_validate_username($valid, $username) {
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  $forbidden = array('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');
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  $pages = get_pages();
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  foreach ($pages as $page) {
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    $forbidden[] = $page->post_name;
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  }
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  if(!$valid || is_user_logged_in() && current_user_can('create_users') ) return $valid;
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  $username = strtolower($username);
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  if ($valid && strpos( $username, ' ' ) !== false) $valid=false;
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  if ($valid && in_array( $username, $forbidden )) $valid=false;
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  if ($valid && strlen($username) < 5) $valid=false;
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  return $valid;
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}
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add_filter('validate_username', 'sozot_validate_username', 10, 2);
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function sozot_registration_errors($errors) {
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  if ( isset( $errors->errors['invalid_username'] ) )
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    $errors->errors['invalid_username'][0] = __( '错误：该用户名不允许注册！', 'sozot' );
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  return $errors;
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}
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add_filter('registration_errors', 'sozot_registration_errors');