Php Woocommerce单个添加到购物车页面中的产品动态定价

我已经重新判断了你的代码，因为有一些错误，错误和遗漏的东西.这里，缺少的是产品添加到购物车表单中的隐藏输入字段，用于在添加到购物车操作中发布您的定制价格.然后你就可以使用这个定制价格了.

由于您似乎正在使用插件中的代码，因此您应该开始将以下内容添加到主插件文件中，以判断WooCommerce是否处于活动状态:

defined( 'ABSPATH' ) or exit;

// Make sure WooCommerce is active
if ( ! in_array( 'woocommerce/woocommerce.php', apply_filters( 'active_plugins', get_option( 'active_plugins' ) ) ) ) {
    return;
}

将css样式文件入队需要单独的函数(you may need to make some CSS changes in your style rules):

add_action( 'wp_enqueue_scripts', 'custom_product_pricing_css' );
function custom_product_pricing_css() {
    // Only on product single pages
    if( ! is_product() ) return;

    wp_enqueue_style('my-plugin-styles', plugins_url('assets/css/diamond_style.css', __FILE__));
}

对于您的自定义数据库查询，最好将每个设置在单独的函数(reason: code modularity)中:

function get_the_gold_rate() {
    global $wpdb;

    return $wpdb->get_var( "SELECT final_price FROM {$wpdb->prefix}gold_rate ORDER BY id DESC LIMIT 1");
}

下面是您重新访问的代码函数，它挂接到了另一个钩子(其中我在产品表单中包含了一个强制隐藏的输入字段):

add_action('woocommerce_before_add_to_cart_button', 'add_to_cart_product_pricing', );
function add_to_cart_product_pricing() {
    global $woocommerce, $product;

    if ( is_a($woocommerce, 'WooCommerce') && is_product() ) {

        // Targeting "ring" or "rings" product category
        if ( has_term( array('ring', 'rings'), 'product_cat' ) ) {
            // Load the latest gold rate
            $gold_rate = (float) get_the_gold_rate();

            // Get net weight product attribute
            $net_weight = $product->get_attribute('net-weight-g');

            // Get product regular price
            $regular_price = $product->get_regular_price();

            // Calculate product updated price
            $updated_price = ($gold_rate * $net_weight) + $regular_price;

            // Get the displayed price 
            $args = array( 'price' => floatval( $updated_price ) );

            if ( 'incl' === get_option('woocommerce_tax_display_shop') ) {
                $displayed_price = wc_get_price_including_tax( $product, $args );
            } else {
                $displayed_price = wc_get_price_excluding_tax( $product, $args );
            }

            // Display product updated price
            printf( '<p class="productprice">%s</p>', wc_price( $displayed_price ) );

            // Display a hidden input field with the "updated_price" as value
            printf( '<input type="hidden" name="updated_price" value="%s" />', $updated_price );
            
            // Get gross weight product attribute 
            $gross_weight = $product->get_attribute('gross-weight');

            // Display the Gross Weight
            printf( '<p class="grossweight">' . __('Weight: %s g') . '</p>', $gross_weight );
        }
    }
}

现在，为了将更新的价格作为定制购物车项目数据包括在内，我们使用以下内容:

add_filter( 'woocommerce_add_cart_item_data', 'save_custom_cart_item_data', 10, 2 );
function save_custom_cart_item_data( $cart_item_data, $product_id ) {

    if( isset($_POST['updated_price']) && ! empty($_POST['updated_price'])  ) {
        // Set the custom data in the cart item
        $cart_item_data['updated_price'] = (float) wc_clean($_POST['updated_price']);

        // Make each item as a unique separated cart item
        $cart_item_data['unique_key'] = md5( microtime().rand() );
    }
    return $cart_item_data;
}

因此，我们现在可以在Minicart中显示具有此自定义更新价格的商品:

add_action( 'woocommerce_cart_item_price', 'filter_cart_displayed_price', 10, 2 );
function filter_cart_displayed_price( $price, $cart_item ) {
    if ( isset($cart_item['updated_price']) ) {
        $args = array( 'price' => floatval( $cart_item['updated_price'] ) );

        if ( 'incl' === get_option('woocommerce_tax_display_cart') ) {
            $product_price = wc_get_price_including_tax( $cart_item['data'], $args );
        } else {
            $product_price = wc_get_price_excluding_tax( $cart_item['data'], $args );
        }
        return wc_price( $product_price );
    }
    return $price;
}

最后，我们使用定制的更新价格设置购物车项目的价格:

add_action( 'woocommerce_before_calculate_totals', 'set_new_cart_item_updated_price' );
function set_new_cart_item_updated_price( $cart ) {
    if ( ( is_admin() && ! defined( 'DOING_AJAX' ) ) )
        return;

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

    // Loop through cart items and set the updated price
    foreach ( $cart->get_cart() as $cart_item ) {
        // Set the new price
        if( isset($cart_item['updated_price']) ){
            $cart_item['data']->set_price($cart_item['updated_price']);
        }
    }
}

代码放在活动子主题(或活动主题)的unctions.php文件中，或者也放在插件中.经过测试，效果良好.

相关:Custom cart item price set from product hidden input field in Woocommerce 3