将值从函数传递到 woocommerce 钩子

Question

在 Woocommerce 中，我尝试将一些值从自定义简单函数传递到 “woocommerce_before_calculate_totals” 操作挂钩中的挂钩函数。但我总是得到一个空值。

我尝试将

$new_price

转储到

add_custom_item_price(

) 函数中，但它仍然是

int(0)

。
我还尝试将

$_POST['fabric_length']

转储到

add_custom_item_price()

函数及其

NULL

。

这是我的代码：

function calculate_new_price() {
    global $post;

    $category = wp_get_post_terms($post->ID,'product_cat');
    $meter_price = get_field('meter_price');
    $price_per_centimeter = $meter_price / 100;
    $total_height_price = $_POST['fabric_length'] * $price_per_centimeter;

    return $total_height_price;
}

$new_price = calculate_new_price();

add_filter( 'woocommerce_before_calculate_totals', 'add_custom_item_price', 10, 1 );
function add_custom_item_price( $cart_object ) {
    global $new_price; <------ returns int(0) when var_dump in this function

    if ( is_admin() && ! defined( 'DOING_AJAX' ) )
        return;

    foreach (  $cart_object->get_cart() as $item_values ) {
        $item_values['data']->set_price(ceil($new_price));
    }
}

我错过了什么？

如有任何帮助，我们将不胜感激。

Answer 1

更新…

这是一个完整的代码（可验证），带有前端和后端自定义字段，将向您展示使其在高级自定义上工作的正确方法，而无需使用高级自定义字段：

// Frontend: The product custom field [FOR TESTING]
add_action( 'woocommerce_before_add_to_cart_button', 'fabric_length_product_field' );
function fabric_length_product_field() {
    global $product;
    // The fake calculated price
    ?>
        <div>
            <label class="product-custom-text-label" for="servicetime"><?php _e( 'Fabric lenght:', 'woocommerce'); ?><br>
                <input type="text" id="fabric_length" name="fabric_length" value="">
            </label>
        </div><br>
    <?php
}

// Backend: Add a custom field to product in backend [FOR TESTING]
add_action( 'woocommerce_product_options_pricing', 'add_field_product_options_pricing' );
function add_field_product_options_pricing() {
    global $post;

    echo '<div class="options_group">';

    woocommerce_wp_text_input( array(
        'id'            => '_meter_price',
        'label'         => __('Metter price', 'woocommerce') . ' (' . get_woocommerce_currency_symbol() . ')',
        'placeholder'   => __('Set the Metter price…', 'woocommerce'),
        'description'   => __('Enter the custom value here.', 'woocommerce'),
        'desc_tip'      => 'true',
    ));

    echo '</div>';
}

// Save product custom field to database when submitted in Backend [FOR TESTING]
add_action( 'woocommerce_process_product_meta', 'save_product_options_custom_fields', 30, 1 );
function save_product_options_custom_fields( $post_id ){
    // Saving custom field value
    if( isset( $_POST['_meter_price'] ) ){
        update_post_meta( $post_id, '_meter_price', sanitize_text_field( $_POST['_meter_price'] ) );
    }
}

// Add custom calculated price conditionally as custom data to cart items
add_filter( 'woocommerce_add_cart_item_data', 'add_custom_price_to_cart_item_data', 20, 2 );
function add_custom_price_to_cart_item_data( $cart_item_data, $product_id ){
    if( ! isset($_POST['fabric_length']) )
        return $cart_item_data;

    // Get your data
    $meter_price = get_post_meta( $product_id, '_meter_price', true );
    if( empty($meter_price) || $meter_price == 0 )
        return $cart_item_data;

    $fabric_length = (float) sanitize_text_field( $_POST['fabric_length'] );
    if( empty($fabric_length) || $fabric_length == 0 )
        return $cart_item_data;

    // Price Calculations and saving
    $cart_item_data['custom_price'] = ceil( $fabric_length * $meter_price / 100 );
    $cart_item_data['unique_key'] = md5( microtime() . rand() ); // Make each item unique

    return $cart_item_data;
}

// Set conditionally a custom item price
add_action('woocommerce_before_calculate_totals', 'set_cutom_cart_item_price', 20, 1);
function set_cutom_cart_item_price( $cart ) {
    if ( is_admin() && ! defined( 'DOING_AJAX' ) )
        return;

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

    foreach (  $cart->get_cart() as $cart_item ) {
        if ( isset( $cart_item['custom_price'] ) )
            $cart_item['data']->set_price( $cart_item['custom_price'] );
    }
}

代码位于活动子主题（或活动主题）的 function.php 文件中。已测试并可以使用。