/* Disable the Admin Bar. */
add_filter( ‘show_admin_bar’, ‘__return_false’ );
remove_action( ‘personal_options’, ‘_admin_bar_preferences’ );

// stop wp notice to update core
add_filter( ‘pre_site_transient_update_core’, create_function( ‘$a’, “return null;” ) );

// stop wp notice to update plugins
remove_action( ‘load-update-core.php’, ‘wp_update_plugins’ );
add_filter( ‘pre_site_transient_update_plugins’, create_function( ‘$a’, “return null;” ) );