我尝试根据我在 Woocommerce 购物车上所做的一些计算来添加费用，但我想将其从增值税中排除。这是我的代码:

function woo_add_cart_fee( $cart ) {
    global $woocommerce; $bookable_total = 0; 

    foreach(WC()->cart->get_cart() as $cart_item_key => $values) { 
        $_product = $values['data'];

        //doing my stuff to calculate $fee variable

    WC()->cart->add_fee( 'Fees: ', $fee, false, '' );
    //WC()->cart->add_fee( 'Fees: ', $fee, true, '' );
    //WC()->cart->add_fee( 'Fees: ', $fee, false, 'zero rate' );
    //WC()->cart->add_fee( 'Fees: ', $fee, true, 'zero rate' );
}

add_action( 'woocommerce_cart_calculate_fees', 'woo_add_cart_fee' );

我已经尝试了所有的评论版本，每个版本都包含增值税费用。

知道如何实现它吗？

最佳答案

(更新):TAX OPTIONS add_fee() method

IMPORTANT: The fact that TAX is working or not with add_fee() method depends first of your tax settings in woocommerce. As you have not tell in your question what are your TAX settings, It's not possible to help you (Tax settings can be much more different for each e-commerce web site).

例如，如果您想使用“零税率”税级，但您尚未为客户国家/地区定义正确的“零税率”税级，如果您尝试这样做将不起作用与它一起使用:
WC()->cart->add_fee( 'Fees: ', $fee, true, 'zero rate' ); ……取决于您的全局税收设置。

这是购物车中 3 件商品的真实结帐总计的屏幕截图(使用下面的代码):

Class WC_Cart add_fee() method, adds additional fee to the cart.

add_fee( string $name, float $amount, boolean $taxable = false, string $tax_class = ''  )

Parameters:
    $name      Unique name for the fee. Multiple fees of the same name cannot be added.
    $amount    Fee amount.
    $taxable   (default: false) Is the fee taxable?
    $tax_class    (default: '') The tax class for the fee if taxable. A blank string is standard tax class.

原始答案 (更新代码):

Your main problem is in this line: global $woocommerce, $bookable_total = 0;

1. As you are using WC()->cart syntax instead of $woocommerce->cart syntax, you don't really need global $woocommerce;.
2. If you use global $bookable_total = 0; this $bookable_total will be always = 0.
   Instead you will use global $bookable_total; without a value to get the value defined outside your function.
   But if you want to set the value to zero, in case is not defined outside your function, you will do it this way: woo_add_cart_fee( $bookable_total=0 )

我们现在可以在函数外定义$bookable_total变量值。

这是您的代码的工作示例:

// This variable value is passed to our function
$bookable_total = 1;

function woo_add_cart_fee( $bookable_total = 0 ) {
    global $bookable_total;

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

    // just for this example
    $item_count = 0;
    $item_fee = 5;

    // going through each cart items
    foreach( WC()->cart->get_cart() as $values ) {
        $item = $values['data'];
        if ( empty( $item ) )
            break;
        // getting the cart item_id
        $item_id = $item->id;
        $item_count++;
        // your calculations
    }

    // We test $bookable_total value, defined to '1' outside our function
    // and to 'O' if not defined outside (in this case the fee will be '0')
    $fee = $item_count * $bookable_total * $item_fee;

    // add_fee method (TAX will NOT be applied here)
    WC()->cart->add_fee( 'Fees: ', $fee, false );

}
add_action( 'woocommerce_cart_calculate_fees','woo_add_cart_fee' );

此代码已经过测试并且可以正常工作。 它位于您的事件子主题或主题的 function.php 文件中。

如果 $bookable_total 变量未在外部定义，则该值将为 0。

Note: is better to get the $items ids with: $item = $values['data']; $item_id = $item->id;

引用:
Class WC_Cart - add_fee( $name, $amount, $taxable = false, $tax_class = '' ) method

关于php - 以编程方式向 WooCommerce 购物车添加免税费用，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/38894444/