Extra fields for wordpress user management in dashboard - php

Question

I need to add extra fields to the Add new user and Edit user pages in wordpress admin dashboard.
I can add this to Edit user using the hook edit_user_profile. But how to add it in Add new user page?
Also I want to add some extra columns to the user wp list table.
add_action( 'edit_user_profile', 'my_show_extra_profile_fields' );
function my_show_extra_profile_fields( $user ) {
}

Answer 1

If you consult the core code, in /wp-admin/user-new.php you can find two hooks:
user_new_form_tag – before the existing form fields
user_new_form – after the existing form fields

Answer 2

If you check /wp-admin/user-new.php you'll see two do_action, though I never tried using any of these hooks
hook to add tags or attribute on form
<form method="post" name="adduser" id="adduser" class="validate" novalidate="novalidate"<?php
/**
* Fires inside the adduser form tag.
*
* #since 3.0.0
*/
do_action( 'user_new_form_tag' );
?>>
and
/**
* Fires at the end of the new user form.
*
* Passes a contextual string to make both types of new user forms
* uniquely targetable. Contexts are 'add-existing-user' (Multisite),
* and 'add-new-user' (single site and network admin).
*
* #since 3.7.0
*
* #param string $type A contextual string specifying which type of new user form the hook follows.
*/
do_action( 'user_new_form', 'add-existing-user' );
and
<?php
/** This action is documented in wp-admin/user-new.php */
do_action( 'user_new_form', 'add-new-user' );
?>
You might also want to check user_register hook