php - WooCommerce 在添加之前检查产品 ID 的库存

Question

我的 WooCommerce 网站中有一些自定义代码，用于将产品添加到用户购物车。我已经让它检查购物车内容以确保购物车中首先有另一种产品，但我还希望它检查正在添加的产品是否也有库存...

我想不出最好的方法。如果您能让我知道要向函数中添加什么以使其检查“product_id”的库存以及库存是否 > 0，我将不胜感激。这是我的代码:

add_action( 'template_redirect', 'add_product_to_cart' );
function add_product_to_cart() {
    if ( ! is_admin() ) {
        $product_id = 21576;
        $found = false;
        global $woocommerce;

        //check if product already in cart

    if ( sizeof( WC()->cart->get_cart() ) > 0 ) {
        foreach ( WC()->cart->get_cart() as $cart_item_key => $values ) {
            $_product = $values['data'];
            if ( $_product->id == $product_id )
                $found = true;
        }
        // if product not found, add it
        if ( ! $found )
            WC()->cart->add_to_cart( $product_id );

        if (sizeof( WC()->cart->get_cart() ) == 1 && $found == true ) {
            $woocommerce->cart->empty_cart();
        }
    } 
}

Answer 1

You can use the WC_Product conditional method is_in_stock() directly in your if statement.

As $product is already a product object, we don't need anything else to make it work with WC_product methods.

也可以使用 WC_cart 方法 is_empty() 代替 sizeof( WC()->cart->get_cart() ) > 0这样! WC()->购物车->is_empty()。

然后您还可以使用 WC_cart get_cart_contents_count() 替换 sizeof( WC()->cart->get_cart() ) == 1这种方法 WC()->cart->get_cart_contents_count() == 1。

如果您使用 WC()->cartglobal woocommerce; 声明> 用 all WC_Cart methods 代替 $woocommerce->cart

Last thing:
May be is better to remove the concerned cart item, instead emptying the cart. So we will use remove_cart_item() method instead.
If is not convenient you can use empty_cart() method as in your original code…

所以你的代码将是:

add_action( 'template_redirect', 'add_product_to_cart' );
function add_product_to_cart() {
    if ( ! is_admin() ) {
        $targeted_product_id = 21576;
        $found = false;

        //check if product already in cart

        if ( ! WC()->cart->is_empty() ) {
            foreach ( WC()->cart->get_cart() as $cart_item_key => $cart_item ) {
                $product = $cart_item['data'];
                if ( $product->id == $targeted_product_id ) {
                    $found = true;
                    break; // We can break the loop
                }
            }
            // Update HERE (we generate a new product object $_product)
            $_product = wc_get_product( $targeted_product_id );
            // If product is not in the cart items AND IT IS IN STOCK
            if ( !$found && $_product->is_in_stock() ) {
                WC()->cart->add_to_cart( $targeted_product_id );
            } 
            elseif ( $found && WC()->cart->get_cart_contents_count() == 1 ) {
                // Removing only this cart item
                WC()->cart->remove_cart_item( $cart_item_key );
                // WC()->cart->empty_cart();
            }
        }
    } 
}

此代码已经过测试并且可以工作。

代码位于您的事件子主题(或主题)的 function.php 文件中。或者也可以在任何插件 php 文件中。