$theme = wp_get_theme( $_GET['stylesheet'] );
if ( ! $theme->exists() || ! $theme->is_allowed() )
wp_die( __( 'Cheatin’ uh?' ) );
$theme = wp_get_theme( $_GET['stylesheet'] );
if ( ! $theme->exists() || ! $theme->is_allowed() )
wp_die( __( 'Cheatin’ uh?' ) );