The filter validate_username sends and expects a boolean value, not a string. Hook into sanitize_user and use mb_strtolower(). Sample code, not tested: add_filter( ‘sanitize_user’, ‘wpse_83689_lower_case_user_name’ ); function wpse_83689_lower_case_user_name( $name ) { // might be turned off if ( function_exists( ‘mb_strtolower’ ) ) return mb_strtolower( $name ); return strtolower( $name ); }
Try echo the_author_meta( ‘nickname’, $current_user->ID ); or you can also use; $current_user = wp_get_current_user(); echo $current_user->nickname;
Renaming admin user on multisite install by MySQL
If the person commenting is already logged in you could capture the user object like so $user = wp_get_current_user(); and then simply grab the username like $user->user_login. Once you have this it shouldn’t be too hard to add in to the creation of a comment so its only asking for the username alone and only … Read more
Unique User for all visitor, but possibility to comment with unique name
How can I display nickname instead username in links
Without the email it will be hard, WordPress likely will not be willing to release that info. You will have a few options: Try any email you would have used in the forgot password function. Search all your emails for the emails you got initially. WordPress sends update emails periodically so whichever one has gotten … Read more
Restrict certain character combinations in username during registration
try my variant: <?php if (!is_user_logged_in()) : ?> <form action=”<?=get_home_url(); ?>myaccount” method=”POST”> <input type=”submit” value=”<?php _e(‘Hello, Client! Click to sign in:’, ‘theme’); ?>”> </form> <?php else: ?> <a href=”<?=get_home_url();?>myaccount”><?php _e(‘Hello ‘, ‘theme’); echo wp_get_current_user()->user_login;?></a> <a href=”<?=wp_logout_url(esc_url( ‘https://’. $_SERVER[‘HTTP_HOST’] . $_SERVER[‘REQUEST_URI’] ));?>myaccount”>Logout</a> <?php endif; ?>
Its nonsensical to lock activation, unless the functional part of your code remains on your site. You essentially can make a service that you hide behind a login or apikey (like akismet) which may or may not make sense for your plugin. Calling home for permission to activate is a terrible idea, because idealistically, it’s … Read more