Disable add to cart for products on backorder in WooCommerce

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;
}

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