Delete user account and keep the posts. This custom code snippet enables user account deletion.

gistfile1.txt

Delete user account and keep the posts.
This custom code snippet enables user account deletion.
Functionalities:

1. User Account Deletion: Allows logged-in users, except administrators, to delete their accounts. It includes a security check (nonce) 
and a confirmation dialog to confirm the user's intention.
2. Content Preservation: On account deletion, the user's content (posts and links) is preserved by unassigning it, rather than deleting it.
3. Security and Integration: Implements a security check to prevent unauthorized access and integrates with WordPress using hooks and shortcodes.
4. Custom Deletion Process: Instead of using WordPress's default user deletion function, it employs a custom method to delete user data while 
keeping their posts and links intact.

Shortcode: [custom_delete]



// Prevent direct access to the script
defined('ABSPATH') or die('No script kiddies please!');

function custom_delete_account() {
    if (is_user_logged_in() && !current_user_can('administrator')) {
        $current_user = wp_get_current_user();
        $user_id = $current_user->ID;
        
        // Create nonce for security
        $nonce = wp_create_nonce('custom_user_delete_nonce');

        // Delete URL with nonce and user ID
        $delete_url = admin_url('admin-post.php?action=custom_user_delete&user_id=' . $user_id . '&_wpnonce=' . $nonce);

        // Delete button with JavaScript confirmation
        $html = '<a href="' . esc_url($delete_url) . '" id="custom-delete-account" onclick="return confirmDeletion();" style="display: inline-block; color: #ffffff !important; text-decoration: none; font-size: 14px; font-weight: 400;">Delete Account?</a>';

        // JavaScript for confirmation dialog
        $html .= '
        <script>
            function confirmDeletion() {
                return confirm("Are you sure you want to delete your account?");
            }
        </script>';

        return $html;
    } else {
        return '<div>Delete.</div>';
    }
}

function custom_user_delete() {
    // Verify nonce for security
    if (!isset($_GET['_wpnonce']) || !wp_verify_nonce($_GET['_wpnonce'], 'custom_user_delete_nonce')) {
        wp_die('Security check failed');
    }

    $user_id = intval($_GET['user_id']);
    
    if (get_current_user_id() == $user_id && !current_user_can('administrator')) {
        // Manually remove user without deleting their content
        custom_remove_user_without_deleting_content($user_id);

        wp_redirect(home_url());
        exit;
    } else {
        wp_die('You do not have permission to perform this action.');
    }
}

function custom_remove_user_without_deleting_content($user_id) {
    global $wpdb;

    // Update the posts and links to be unassigned
    $wpdb->update($wpdb->posts, ['post_author' => 0], ['post_author' => $user_id]);
    $wpdb->update($wpdb->links, ['link_owner' => 0], ['link_owner' => $user_id]);

    // Delete user without using wp_delete_user
    wp_cache_delete($user_id, 'users');
    wp_cache_delete($user_id, 'user_meta');

    $wpdb->delete($wpdb->users, ['ID' => $user_id]);
    $wpdb->delete($wpdb->usermeta, ['user_id' => $user_id]);

    // Cleanup user-related capabilities and metadata
    clean_user_cache($user_id);
}

add_action('admin_post_custom_user_delete', 'custom_user_delete');
add_shortcode('custom_delete', 'custom_delete_account');