为了真正满足您的需要，我认为最好重写wp_insert_user() 函数，某些部分可以询问您

   $user_email = apply_filters( \'pre_user_email\', $raw_user_email );

   $illegal_logins = (array) apply_filters( \'illegal_user_logins\', array() );

if ( in_array( strtolower( $user_login ), array_map( \'strtolower\', $illegal_logins ) ) ) {
    return new WP_Error( \'invalid_username\', __( \'Sorry, that username is not allowed.\' ) );
}

     if ( isset( $userdata[\'role\'] ) ) {
         $user->set_role( $userdata[\'role\'] );
     } elseif ( ! $update ) {
         $user->set_role(get_option(\'default_role\'));
     }

希望有帮助！