How can one ensure the security and stability of a PHP-based website when using a free CMS?

One way to ensure the security and stability of a PHP-based website when using a free CMS is to regularly update both the CMS software and any plugins or themes being used. This helps to patch any known security vulnerabilities and ensure compatibility with the latest PHP versions. Additionally, implementing strong password policies, using secure hosting, and regularly backing up the website can help protect against potential security threats.

// Example code for updating a WordPress website
if ( current_user_can('administrator') ) {
    require_once ABSPATH . 'wp-admin/includes/admin.php';
    $update_core = update_core();
    $update_plugins = update_plugins();
    $update_themes = update_themes();
    if ( $update_core || $update_plugins || $update_themes ) {
        echo 'Website updated successfully.';
    } else {
        echo 'No updates available.';
    }
}