MatthewMi11er/wordpress-plugin-mi11er-utility

<?php
/**
 * Replaces the author slug (user_nicename) with a sanitized version of the user's display name.
 *
 * @see https://wordpress.org/plugins/wp-author-slug/
 *
 * @package Mi11er\Utility
 */

namespace Mi11er\Utility;

/**
 * The Author_Slug Class
 *
 * This replaces the WP-Author-Slug plugin.
 * WARNING: This will change the permalink for author pages. Also updating a user outside of the admin interface may cause this to break.
 *
 * @TODO refactor using more robust methods.
 */
class Author_Slug implements Plugin_Interface
{
    /**
     * Run whatever is needed for plugin setup
     */
    public function setup() {
        add_filter( 'pre_user_nicename', [ $this, 'pre_user_nicename_filter' ], 10, 1 );
    }

    /**
     * Run whatever is needed ofr plugin activation
     *
     * Overwrites the users' nicenames with the users' display name.
     */
    public function activate() {
        $users = get_users(array(
            'blog_id' => '',
            'fields'  => array( 'ID', 'display_name' ),
        ) );

        foreach ( $users as $user ) {
            if ( $user->display_name ) {
                wp_update_user( array(
                    'ID'            => $user->ID,
                    'user_nicename' => sanitize_title( $user->display_name ),
                ) );
            }
        }
    }

    /**
     * Callback for the `pre_user_nicename` filter hook
     *
     * Runs on user save or update.
     *
     * @param string $user_nicename The user's nicename.
     *
     * @return string
     */
    public function pre_user_nicename_filter( $user_nicename ) {
        return isset( $_REQUEST['display_name'] ) ? sanitize_title( wp_unslash( $_REQUEST['display_name'] ) ) : $user_nicename; // WPCS: input var ok.
    }
}