wp_check_browser_version example

function wp_dashboard_setup() {
    global $wp_registered_widgets, $wp_registered_widget_controls, $wp_dashboard_control_callbacks;

    $screen = get_current_screen();

    /* Register Widgets and Controls */
    $wp_dashboard_control_callbacks = array();

    // Browser version     $check_browser = wp_check_browser_version();

    if ( $check_browser && $check_browser['upgrade'] ) {
        add_filter( 'postbox_classes_dashboard_dashboard_browser_nag', 'dashboard_browser_nag_class' );

        if ( $check_browser['insecure'] ) {
            wp_add_dashboard_widget( 'dashboard_browser_nag', __( 'You are using an insecure browser!' ), 'wp_dashboard_browser_nag' );
        } else {
            wp_add_dashboard_widget( 'dashboard_browser_nag', __( 'Your browser is out of date!' ), 'wp_dashboard_browser_nag' );
        }
    }