random sort

// https://www.templatemonster.com/help/woocommerce-how-to-set-random-order-for-products.html

add_filter( 'woocommerce_get_catalog_ordering_args', 'custom_woocommerce_get_catalog_ordering_args' );
 
function custom_woocommerce_get_catalog_ordering_args( $args ) {
$orderby_value = isset( $_GET['orderby'] ) ? woocommerce_clean( $_GET['orderby'] ) : apply_filters( 'woocommerce_default_catalog_orderby', get_option( 'woocommerce_default_catalog_orderby' ) );
 
if ( 'random_list' == $orderby_value ) {
$args['orderby'] = 'rand';
$args['order'] = '';
$args['meta_key'] = '';
}
return $args;
}
 
add_filter( 'woocommerce_default_catalog_orderby_options', 'custom_woocommerce_catalog_orderby' );
add_filter( 'woocommerce_catalog_orderby', 'custom_woocommerce_catalog_orderby' );
 
function custom_woocommerce_catalog_orderby( $sortby ) {
$sortby['random_list'] = 'Random';
return $sortby;
}