抱歉，伙计们，不得不再次发布此消息，因为网站不允许我回复评论（新帐户）。

我一直在编写一些代码，以根据自定义字段的数值减少可变产品的数量。

这很好，但是我已经实现了一个复选框，基本上可以打开/关闭每个产品上的功能。此自定义复选框也可以正常工作，出现在“Product General Settings”（产品常规设置）中，并存储数据良好-我已通过产品页面上的VAR\\u DUMP（）确认了这一点，它准确地转储了yes-（长度=3）。

虽然数据正在存储，但我似乎无法将其用作条件，如果（\'是\'==$stock\\u weight\\u复选框）数量的正确减少不起作用，则该条件何时到位。

我似乎无法在此过程中使用VAR\\u DUMP（），因为它发生在签出确认过程中，所以我看不到此时是否显示了任何值。

我的假设如下：我不正确地调用此区域中的post\\u meta（checkout）。也许这个电话在产品页面上有效，但我遗漏了一些东西，或者我处理电话的方式不正确。

这是一个可变产品，在签出期间正在常规设置区域中查找自定义字段，此时该字段不可用？（猜测）

代码如下：

// reduce stock based on \'custom_field\'

add_filter( \'woocommerce_order_item_quantity\', \'filter_order_item_quantity\', 10, 3 ); 
function filter_order_item_quantity( $quantity, $order, $item )  
{
    $product   = $item->get_product();
    $term_name = $product->get_meta( \'custom_field\', true );
    $stock_weight_checkbox = $product->get_meta( \'_stock_weight_checkbox\', true );

    // \'pa_weight\' attribute value is "15 grams" - keep only the numbers
    $quantity_grams = preg_replace(\'/[^0-9.]+/\', \'\', $term_name);

    // new quantity
    if( \'yes\' == $stock_weight_checkbox && is_numeric ( $quantity_grams ) && $quantity_grams != 0 )
        $quantity *= $quantity_grams;

    return $quantity;
}

function validate_attribute_weight( $passed, $product_id, $quantity, $variation_id = null, $variations = null ) {
    // Get custom field
    $weight = get_post_meta( $variation_id, \'custom_field\', true );
    $stock_weight_checkbox = get_post_meta( get_the_id(),\'_stock_weight_checkbox\', true );

    if ( \'yes\' == $stock_weight_checkbox && ! empty( $weight ) ) {
        // Get product object
        $product = wc_get_product( $product_id );

        // Get current product stock
        $product_stock = $product->get_stock_quantity();

        // ( Weight * quantity ) > product stock
        if( ( ( $weight * $quantity ) > $product_stock ) ) {
            wc_add_notice( sprintf( \'Sorry, you cannot add <strong>\' . $weight .\'</strong> of <strong>%1$s</strong> to the cart because there are only <strong>%2$sg</strong> left in our inventory. Please choose a lesser amount. We hope to have more in stock shortly.\', $product->get_name(), $product_stock ), \'error\' );
            $passed = false;
        }
    }

    return $passed;
}
add_filter( \'woocommerce_add_to_cart_validation\', \'validate_attribute_weight\', 10, 5 );

有人注意到什么不对吗？或者至少让我知道如何在签出过程中查看VAR\\u DUMP（）？（我习惯于在页面的某个部分（即：产品页面）上吐痰）

function validate_attribute_weight( $passed, $product_id, $quantity, $variation_id = null, $variations = null ) {

    // Get custom field

    // 1. I am not sure if you directly get the post meta using WP builtin return expected result or not since I can see you use $product->get_meta() before
    // $weight = get_post_meta( $variation_id, \'custom_field\', true );
    // $stock_weight_checkbox = get_post_meta( get_the_id(),\'_stock_weight_checkbox\', true );

    // you may try to change to
    // current product from the filter, it is better than get_the_id() because if filter provides to you, more directly and bullet-proof
    $product           = wc_get_product( $product_id );

    // with $product fetched, you may use the same code previously which ensure consistency 
    $stock_weight_checkbox = $product->get_meta( \'_stock_weight_checkbox\', true );

    if ( \'yes\' == $stock_weight_checkbox && ! empty( $weight ) ) {
        // Get product object
        // $product = wc_get_product( $product_id ); // since already get, no need to do so

        // Get current product stock
        $product_stock = $product->get_stock_quantity();

        // ( Weight * quantity ) > product stock
        if( ( ( $weight * $quantity ) > $product_stock ) ) {
            wc_add_notice( sprintf( \'Sorry, you cannot add <strong>\' . $weight .\'</strong> of <strong>%1$s</strong> to the cart because there are only <strong>%2$sg</strong> left in our inventory. Please choose a lesser amount. We hope to have more in stock shortly.\', $product->get_name(), $product_stock ), \'error\' );
            $passed = false;
        }
    }

    // what you concern is the testing logic, if you want to intercept, you may add exit()
    // var_dump() here
    exit();

    return $passed;
}
add_filter( \'woocommerce_add_to_cart_validation\', \'validate_attribute_weight\', 10, 5 );