在 Woocommerce 单品页面和购物车上有条件地设置特定的产品价格

Question

在 Woocommerce 中，我想在单个产品页面和相关购物车项目上更改特定产品（在本例中 ID 为 87）的价格。

产品价格需要增加 10 美元，但只能在单个产品页面上，并且只能在外部（这样 Woocommerce 中设置的内部价格或价格不会改变）。

此外，此价格也应在购物车中更改，但前提是某个类别的产品不在购物车中。

背景：如果有人单独购买此产品，则应向他们收取高于正常价格 10 美元的费用。如果有人与某个类别的产品一起购买此商品，则应向他们收取正常价格。 这本质上是一种反向折扣（我不想使用优惠券功能收取额外费用）。

对于购物车功能，到目前为止，我有这个，但它不起作用 - 当当前的常规/基本价格为 45 美元时，购物车价格为 75 美元。我不知道 75 应该是 55 是从哪里来的。

function wc_cart_custom_price( $cart_object ) {
        if ( is_admin() && ! defined( 'DOING_AJAX' ) )
        return;

        // set our flag to be false until we find a product in that category
        $cat_check = false;

        // check each cart item for our category
        foreach ( WC()->cart->get_cart() as $cart_item_key => $cart_item ) {

            $product = $cart_item['data'];

            // replace 'your-category' with your category's slug
            if ( has_term( 'your-category', 'product_cat', $product->id ) ) {
                $cat_check = true;
                // break because we only need one "true" to matter here
                break;
            }
        }

        // if a product in the cart is in our category, stop there and don't change price
        if ( $cat_check ) {
            return;
        }
        // else continue and alter the product price
        else if ( $cart_item['product_id'] == 87 ) {
            // we have the right product, do what we want
            $price = $cart_item['data']->get_price(); // Get the product price
            $new_price = $price + 10; // the calculation
            $cart_item['data']->set_price( $new_price ); // Set the new price
            }
}
add_action( 'woocommerce_before_calculate_totals', 'wc_cart_custom_price' );

目前我更改产品页面价格的代码是：

function wc_change_product_price($price, $product) {
    if ( is_single('87') ) {
        $post_id = $product->id;

        $regular_price = get_post_meta( $post_id, '_regular_price', true);
        $custom_value = ( $regular_price + 10 );
        $price = $custom_value;

    return $price;
    }
}
add_filter('woocommerce_get_price', 'wc_change_product_price', 99);

这是一场灾难并导致 500 服务器错误。我做错了什么？欢迎任何帮助。

参考资料：

Change cart item prices in WooCommerce version 3.0

https://rudrastyh.com/woocommerce/change-product-prices-in-cart.html

https://www.skyverge.com/blog/checking-woocommerce-cart-contains-product-category/

Answer 1

更新 3 （仅适用于已定义的产品 ID）

为了让它工作，因为您只想在单个产品页面上更改简单产品价格（不更改存档产品价格、相关产品价格、追加销售和交叉销售）如果任何购物车项目不属于特定的产品类别。

那么您将需要以下所有代码：

// Change displayed price on single product pages
add_action( 'woocommerce_single_product_summary', 'change_simple_product_price_html', 9 );
function change_simple_product_price_html() {
    global $product;

    // Only for product ID 87
    if( $product->get_id() != 87 ) return;

    // HERE set your product category term ID, slug or name
    $product_category = 't-shirts';

    // Checking for the product category in cart items loop
    foreach ( WC()->cart->get_cart() as $cart_item ) {
        if ( has_term( $product_category, 'product_cat', $cart_item['product_id'] ) )
            return; // Product category found ==> We EXIT from this function
    }

    remove_action( 'woocommerce_single_product_summary', 'woocommerce_template_single_price', 10 );
    add_action( 'woocommerce_single_product_summary', 'custom_simple_product_price_html', 10 );
}

function custom_simple_product_price_html(){
    global $product;

    $addp = 10; // Here the price additional amount

    if ( '' !== $product->get_price() && ! $product->is_on_sale() ) {
        $price = wc_price( wc_get_price_to_display( $product ) + $addp ) . $product->get_price_suffix();
    }
    echo '<p class="price">' . apply_filters( 'woocommerce_get_price_html', $price, $product ) . '</p>';
}

// Add custom calculated price to cart item data
add_filter( 'woocommerce_add_cart_item_data', 'add_cart_simple_product_custom_price', 20, 2 );
function add_cart_simple_product_custom_price( $cart_item_data, $product_id ){
    // Only for product ID 87
    if( $product_id != 87 ) 
        return $cart_item_data;

    $product = wc_get_product($product_id); // The WC_Product Object

    // Only if product is not on sale
    if( $product->is_on_sale() ) 
        return $cart_item_data;

    $price = (float) $product->get_price();

    // Set the custom amount in cart object
    $cart_item_data['new_price'] = $price + 10;

    return $cart_item_data;
}

// Set custom calculated price to cart
add_action( 'woocommerce_before_calculate_totals', 'set_cart_simple_product_custom_price', 20, 1 );
function set_cart_simple_product_custom_price( $cart ) {
    if ( is_admin() && ! defined( 'DOING_AJAX' ) )
        return;

    if ( did_action( 'woocommerce_before_calculate_totals' ) >= 2 )
        return;

    // HERE set your product category term ID, slug or name
    $product_category = 't-shirts';

    // 1st cart items Loop: checking for the product category
    foreach ( $cart->get_cart() as $cart_item ) {
        if ( has_term( $product_category, 'product_cat', $cart_item['product_id'] ) )
            return; // Product category found ==> We EXIT from this function
    }

    // 2nd Loop: Changing cart item prices (Product category not found)
    foreach ( $cart->get_cart() as $cart_item ) {
        if( isset($cart_item['new_price']))
            $cart_item['data']->set_price( $cart_item['new_price'] );
    }
}

代码进入您的活动子主题（或活动主题）的 function.php 文件中。经过测试并且可以工作。

Answer 2

如果您想在单个产品页面上更改产品价格。 请按照此代码进行操作，我已添加我的产品 ID“99”：

add_action( 'woocommerce_single_product_summary', 'e_coding_change_simple_product_price_html', 9 );
function e_coding_change_simple_product_price_html() {
    global $product;

// Only for product ID 99
if( $product->get_id() != 99 ) return;

// HERE set your product category term ID, slug or name
$product_category = 'my-book';

// Checking for the product category in cart items loop
foreach ( WC()->cart->get_cart() as $cart_item ) {
    if ( has_term( $product_category, 'product_cat', $cart_item['product_id'] ) )
        return; // Product category found ==> We EXIT from this function
}

remove_action( 'woocommerce_single_product_summary', 'woocommerce_template_single_price', 10 );
add_action( 'woocommerce_single_product_summary', 'custom_simple_product_price_html', 10 );
}

function custom_simple_product_price_html(){
global $product;

$addp = 10; // Here the price additional amount

if ( '' !== $product->get_price() && ! $product->is_on_sale() ) {
    $price = wc_price( wc_get_price_to_display( $product ) + $addp ) . $product->get_price_suffix();
}
echo '<p class="price">' . apply_filters( 'woocommerce_get_price_html', $price, $product ) .'</p>';
}

// Add custom calculated price to cart item data

add_filter( 'woocommerce_add_cart_item_data', 'add_cart_simple_product_custom_price', 20, 2 );

function add_cart_simple_product_custom_price( $cart_item_data, $product_id ){

// Only for product ID 87
if( $product_id != 99 )
    return $cart_item_data;

$product = wc_get_product($product_id); // The WC_Product Object

// Only if product is not on sale
if( $product->is_on_sale() )
    return $cart_item_data;

$price = (float) $product->get_price();

// Set the custom amount in cart object
$cart_item_data['new_price'] = $price + 10;

return $cart_item_data;
}


function cw_change_product_price_display( $price ) {

    $price .= ' At Each Item Product';
    return $price;

}

add_filter( 'woocommerce_get_price_html', 'cw_change_product_price_display' );
add_filter( 'woocommerce_cart_item_price', 'cw_change_product_price_display' );