rapidwebltd/deactivate-user-plugin

<?php

/**
 * Plugin Name: Deactivate user plugin
 * Plugin URI: https://github.com/rapidwebltd/deactivate-user-plugin/
 * Description: Allows a user to deactive their own user account from within the WordPress login area, or via the shortcode
 * Version: 1.0
 * Author: Jordan Hall
 * Author URI: http://jordanhall.co.uk/
 * License: MIT.
 */
$jhdup_page_slug = 'deactivate_my_account';

add_action('admin_menu', 'jhdup_deactivate_my_account_menu');

add_shortcode('jhdup_deactivate_current_user_shortcode', 'jhdup_deactivate_current_user_shortcode_handler');

function jhdup_deactivate_my_account_menu()
{
    global $jhdup_page_slug;

    add_menu_page('Deactivate my account', 'Deactivate my account', 'read', $jhdup_page_slug, 'jhdup_deactivate_my_account');
}

function jhdup_deactivate_my_account()
{
    global $jhdup_page_slug;

    if (isset($_GET['confirm'])) {
        jhdup_perform_deactivation_of_current_user();

        echo '<div class="wrap">';
        echo '<h1>Deactivate my account</h1>';
        echo '<p>Your account has been deactivated and you have been logged out.</p>';
        echo '<p><a href="/">Return to the homepage</a></p>';
        echo '</div>';
    } else {
        echo '<div class="wrap">';
        echo '<h1>Deactivate my account</h1>';
        echo '<p>Are you sure you want to delete your account?</p>';
        echo '<p><a href="?page='.$jhdup_page_slug.'&confirm">Yes, deactivate my account</p>';
        echo '<p><a href="./">No, return to the dashboard</p>';
        echo '</div>';
    }
}

function jhdup_deactivate_current_user_shortcode_handler()
{
    jhdup_perform_deactivation_of_current_user();

    $return = '';
    $return .= '<p>Your account has been deactivated and you have been logged out.</p>';
    $return .= '<p><a href="/">Return to the homepage</a></p>';

    return $return;
}

function jhdup_perform_deactivation_of_current_user()
{
    global $wpdb;
    global $current_user;

    get_currentuserinfo();

    $dectivation_suffix = '___jhdup'.rand(0, 99999);

    $new_data = ['user_login'        => $current_user->user_login.$dectivation_suffix,
                        'user_email' => $current_user->user_email.$dectivation_suffix,
                     ];

    $wpdb->update($wpdb->users, $new_data, ['ID' => $current_user->ID]);

    $wpdb->update($wpdb->posts, ['post_status' => 'draft'], ['post_author' => $current_user->ID]);

    wp_logout();
}