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What would I have to do to prevent users changing their display_name?

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You can use jQuery to disable the display name select.

function disable_display_name() {
    global $pagenow;
    if ( $pagenow == 'profile.php' ) {
    ?>
        <script>
            jQuery( document ).ready(function() {
                jQuery('#display_name').prop('disabled', 'disabled');
            });
        </script>
    <?php
    }
}
add_action( 'admin_head', 'disable_display_name', 15 );
  • NOTE: This solution only disables the form field. Should a User have any basic knowledge of HTML and/or modern web browsers, this can be quickly circumvented. – Luke Stevenson May 10 at 5:20

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