WordPress code update user name trong Admin CMS không sử dụng plugin

WordPress code update user name trong Admin CMS không sử dụng plugin

<?php
// Add username field to the profile page
function allow_username_editing( $user ) {
    ?>
    <h3>Đổi tên Tác giả</h3>
    <table class="form-table">
        <tr>
            <th><label for="username">Tên tác giả</label></th>
            <td>
                <input type="text" name="username" id="username" value="<?php echo esc_attr( $user->user_login ); ?>" class="regular-text" />
                <span class="description">Nhập tên tác giả các ký tự từ a-z viết thường.</span>
            </td>
        </tr>
    </table>
    <?php
}
add_action( 'show_user_profile', 'allow_username_editing' );
add_action( 'edit_user_profile', 'allow_username_editing' );

// Save the new username
function save_edited_username( $user_id ) {
    if ( ! current_user_can( 'edit_user', $user_id ) ) {
        return false;
    }

    if ( isset( $_POST['username'] ) && ! empty( $_POST['username'] ) ) {
        $username = sanitize_user( $_POST['username'] );

        // Check if the username is already taken
        if ( username_exists( $username ) ) {
            add_action( 'user_profile_update_errors', function( $errors ) {
                $errors->add( 'username_error', __( 'This username is already taken. Please choose another one.' ) );
            } );
        } else {
            // Update the username in the database
            global $wpdb;
            $wpdb->update(
                $wpdb->users,
                array( 'user_login' => $username ),
                array( 'ID' => $user_id )
            );
            clean_user_cache( $user_id );
        }
    }
}
add_action( 'personal_options_update', 'save_edited_username' );
add_action( 'edit_user_profile_update', 'save_edited_username' );