Php 有条件的运费率基于购物车小计与WooPayments货币转换

似乎插件WooPayments插件已经在使用woocommerce_package_rates钩子，所以也许降低钩子优先级将采取之前的手，允许WooPayments插件转换，使其工作在您的定制运费.

此外，您的代码可以被简化/优化.最后，您当前代码中缺少税率处理.

try 以下方法:

add_filter( 'woocommerce_package_rates', 'custom_flat_rate_shipping_cost', 1, 2 );
function custom_flat_rate_shipping_cost( $rates, $package ) {
    // Define shipping rates costs based on cart subtotal thresholds
    $threshold_shipping_rate_cost = [
        ['threshold' => 200,  'rate' => 5],
        ['threshold' => 100,  'rate' => 10],
        ['threshold' => 50,   'rate' => 15],
        ['threshold' => 0,    'rate' => 20],
    ];

    // Get Cart Subtotal excl. taxes for the current shipping package
    $subtotal = $package['contents_cost']; 

    // Find the appropriate shipping rate
    foreach ($rates as $rate_key => $rate) {
        if ( 'flat_rate' !== $rate->method_id ) continue;

        foreach ($threshold_shipping_rate_cost as $data) {
            if ( $subtotal >= $data['threshold']) {
                $base_cost = $rate->cost; // Original rate cost
                $has_taxes = false; // Initializing
                $taxes     = array(); // Initializing

                $rates[$rate_key]->cost = $data['rate']; // Set the new cost

                // Loop through taxes array (change taxes rate cost if enabled)
                foreach ($rate->taxes as $key => $tax){
                    if( $tax > 0 ){
                        $conv_rate   = $tax / $base_cost; // Get the conversion tax rate
                        $taxes[$key] = $data['rate'] * $conv_rate; // Set the new tax cost in the array
                        $has_taxes   = true; // Enabling tax changes
                    }
                } 
                // Set the array of shipping tax cost (if any)
                if( $has_taxes ) {
                    $rates[$rate_key]->taxes = $taxes;
                }
                break;
            }
        }
    }
    return $rates;
}

代码将在子主题的functions.php文件中(或插件中).它可以工作.

Important:您必须清空购物车以刷新送货方式缓存.

注意，$package['contents_cost'] (or 101)是购物车小计excluding taxes.购物车小计including taxes，使用$package['cart_subtotal'] (or 103).