Transform user name before displaying

Hard to say without seeing any code as to how you are building it out but one suggestion would be to update the field on submit prior to running your register_new_user function. PHP strtolower() Function can be used when passing the data to your custom field Javascript/jQuery you can use .toLowerCase() on the field

wp_authenticate_username_password not authenticating properly when pass username and password

Looking at the source code of wp_authenticate_username_password(), if you’re passing a valid WP_User object in the $user_obj parameter, it will simply be returned. Only if $user_obj is not a valid WP_User will the $username and $password parameters be checked. If you’re trying to ensure a user’s username and password are valid, I’d recommend using wp_authenticate() … Read more

WordPress user password reset not working

Check the error.log files in site root and wp-admin folder for any clues. It’s also possible a plugin is interfering with the mail() command – maybe one that changes the login? You could temp disable all plugins and then try the password reset process. If it works then, enable plugins one at a time to … Read more

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