Returns the screen layout options.

function screen_layout( $screen ) {
	_deprecated_function( __FUNCTION__, '3.3.0', '$current_screen->render_screen_layout()' );

	$current_screen = get_current_screen();

	if ( ! $current_screen )
		return '';

	ob_start();
	$current_screen->render_screen_layout();
	return ob_get_clean();
}