how to make wordpress admin screen fields required - wordpress

Question

I was wondering if it is possible to make fields in the admin area (for instance on the user page) required or optional.

Answer 1

Here I have take reference URL https://www.cssigniter.com/how-to-add-a-custom-user-field-in-wordpress/
Showing the user field
As mentioned in the registration form, actions ‘show_user_profile‘ and ‘edit_user_profile‘ are available for adding our own user fields. The former fires when users are seeing/editing their own profile information, while the latter fires when a user (such as an admin) sees/edits another user’s profile. Both actions pass a WP_User object as their sole parameter. Our previous code, which already uses those actions, was this:
add_action( 'show_user_profile', 'crf_show_extra_profile_fields' );
add_action( 'edit_user_profile', 'crf_show_extra_profile_fields' );
function crf_show_extra_profile_fields( $user ) { ?>
<h3><?php esc_html_e( 'Personal Information', 'crf' ); ?></h3>
<table class="form-table">
<tr>
<th><label for="year_of_birth"><?php esc_html_e( 'Year of birth', 'crf' ); ?></label></th>
<td><?php echo esc_html( get_the_author_meta( 'year_of_birth', $user->ID ) ); ?></td>
</tr>
</table>
<?php
}
Let’s go ahead and change the plain text year of birth, to an input element, so that it may accept user input.
add_action( 'show_user_profile', 'crf_show_extra_profile_fields' );
add_action( 'edit_user_profile', 'crf_show_extra_profile_fields' );
function crf_show_extra_profile_fields( $user ) {
$year = get_the_author_meta( 'year_of_birth', $user->ID );
?>
<h3><?php esc_html_e( 'Personal Information', 'crf' ); ?></h3>
<table class="form-table">
<tr>
<th><label for="year_of_birth"><?php esc_html_e( 'Year of birth', 'crf' ); ?></label></th>
<td>
<input type="number"
min="1900"
max="2017"
step="1"
id="year_of_birth"
name="year_of_birth"
value="<?php echo esc_attr( $year ); ?>"
class="regular-text"
/>
</td>
</tr>
</table>
<?php
}
Let’s check our profile page: