uninstall.php

<?php

//if uninstall not called from WordPress exit
if (!defined('WP_UNINSTALL_PLUGIN')) {
    exit();
}

/** @var wpdb $wpdb */
global $wpdb;

// only uninstall if no BackWPup Version active.
if ( ! class_exists( \BackWPup::class ) ) {

    //delete plugin options
    if (is_multisite()) {
        $wpdb->query('DELETE FROM ' . $wpdb->sitemeta . " WHERE meta_key LIKE '%backwpup_%' ");
    } else {
        $wpdb->query('DELETE FROM ' . $wpdb->options . " WHERE option_name LIKE '%backwpup_%' ");
    }

    //delete Backwpup user roles
    // Special handling for multisite when network-activated.
    if (is_multisite()) {
        $sites = get_sites([
            'fields' => 'ids',
        ]);
        $current_site = get_current_blog_id();

        foreach ($sites as $site) {
            switch_to_blog($site);
            backwpup_remove_roles();
        }

        switch_to_blog($current_site);
    } else {
        backwpup_remove_roles();
    }
}

/**
 * Removes BackWPup roles and capabilities.
 */
function backwpup_remove_roles()
{
    remove_role('backwpup_admin');
    remove_role('backwpup_helper');
    remove_role('backwpup_check');

    //remove capabilities to administrator role
    $role = get_role('administrator');
    if (is_object($role) && method_exists($role, 'remove_cap')) {
        $role->remove_cap('backwpup');
        $role->remove_cap('backwpup_jobs');
        $role->remove_cap('backwpup_jobs_edit');
        $role->remove_cap('backwpup_jobs_start');
        $role->remove_cap('backwpup_backups');
        $role->remove_cap('backwpup_backups_download');
        $role->remove_cap('backwpup_backups_delete');
        $role->remove_cap('backwpup_logs');
        $role->remove_cap('backwpup_logs_delete');
        $role->remove_cap('backwpup_settings');
        $role->remove_cap('backwpup_restore');
    }
}