hide update core wordpress

add_action ( 'after_setup_theme' , 'remove_core_updates' );
function remove_core_updates ()
{
if (! current_user_can ( 'update_core' )){ return ;}
add_action ( 'init' , create_function ( '$a' , "remove_action( 'Init', 'wp_version_check' );" ), 2 );
add_filter ( 'pre_option_update_core' , '__return_null' );
add_filter ( 'pre_site_transient_update_core' , '__return_null' );
}