Disable add to cart for products on backorder in WooCommerce

[sebastian-moran]

Disable add to cart for products on backorder in WooCommerce on child sites.

Snippet Type

Execute on Child Sites

Snippet

add_filter('woocommerce_is_purchasable', 'disable_add_to_cart', 10, 2);

function disable_add_to_cart($purchasable, $product) {
    if ($product->is_on_backorder(1))
        $purchasable = false;
    return $purchasable;
}