Add percentage increase to all WooCommerce shipping rates programmatically

I'm trying to add a 65% increase across all shipping methods.

I've used variations of this function but this doesn't affect the rates that are returned.

function increase_shipping_costs() {
  // Get the current shipping rates
  $shipping_zones = WC_Shipping_Zones::get_zones();

  foreach ( $shipping_zones as $zone ) {
    foreach ( $zone['shipping_methods'] as $shipping_method ) {
      // Check if the shipping method is a flat rate
      if ( !$shipping_method->id === 'free_shipping' ) {
        // Get the current cost
        $current_cost = $shipping_method->cost;

        // Calculate the increased cost
        $increased_cost = $current_cost + ( $current_cost * 0.65 );

        // Update the shipping cost
        $shipping_method->cost = $increased_cost;
        $shipping_method->save();
      }
    }
  }
}

add_filter('woocommerce_package_rates', 'increase_shipping_costs', 10, 2);

The filter's callback is not setup properly:

• function parameters are missing
• no value being returned (filters require a return value)

You'll want to use the data provided through the filter (ex: $package_rates) rather than WC_Shipping_Zones::get_zones().

function increase_shipping_costs( $package_rates, $package ) {
    ...

    return $package_rates;
}
add_filter( 'woocommerce_package_rates', 'increase_shipping_costs', 10, 2 );

</details>



# 答案2
**得分**: 1

要在所有运输方式费用上增加65％的费用，`woocommerce_package_rates`是正确的过滤器挂钩，但您需要修改函数中的大部分内容以使其正常工作（因为代码中有一些缺少的部分和错误）：

```php
add_filter('woocommerce_package_rates', 'increase_shipping_costs', 10, 2);
function increase_shipping_costs($rates, $package) {
    $rate_multiplier = 1.65; // 增加65%的费用
    
    // 循环遍历运输费率
    foreach ($rates as $rate_key => $rate) {
        
        if ('free_shipping' !== $rate->method_id && $rate->cost > 0) {
            $has_taxes = false; // 初始化
            $taxes     = array(); // 初始化

            $rates[$rate_key]->cost = $rate->cost * $rate_multiplier; // 设置新的费率费用
            
            // 循环遍历税收数组（如果启用，更改税率费用）
            foreach ($rate->taxes as $key => $tax) {
                if ($tax > 0) {
                    $taxes[$key] = $tax * $rate_multiplier; // 在数组中设置新的税费用
                    $has_taxes   = true; // 启用税收更改
                }
            }
            // 设置运输税费用数组
            if ($has_taxes) {
                $rates[$rate_key]->taxes = $taxes;
            }
        }
    }
    // 对于过滤器挂钩，始终返回主要参数
    return $rates; 
}

代码放在活动子主题（或活动主题）的functions.php文件中。它应该能够正常工作。

add_filter('woocommerce_package_rates', 'increase_shipping_costs', 10, 2);
function increase_shipping_costs( $rates, $package ) {
    $rate_multiplier = 1.65; //  65% increase cost
    
    // Loop through shipping rates
    foreach ( $rates as $rate_key => $rate ) {
        
        if ( 'free_shipping' !== $rate->method_id && $rate->cost > 0 ) {
            $has_taxes = false; // Initializing
            $taxes     = array(); // Initializing

            $rates[$rate_key]->cost = $rate->cost * $rate_multiplier; // Set new rate cost
            
            // Loop through taxes array (change taxes rate cost if enabled)
            foreach ($rate->taxes as $key => $tax){
                if( $tax > 0 ){
                    $taxes[$key] = $tax * $rate_multiplier; // Set the new tax cost in the array
                    $has_taxes   = true; // Enabling tax changes
                }
            }
            // set array of shipping tax cost
            if( $has_taxes ) {
                $rates[$rate_key]->taxes = $taxes;
            }
        }
    }
    // For a filter hook, always return the main argument
    return $rates; 
}