/**
* calculates the total tax rate that is applied to a product from the applied
* tax classes defined on the product.
*
* @param array $product_rates_array the product rates array
* @return mixed null if no taxes or array is null, otherwise the total tax rate to apply
*/
public static function calculate_total_tax_rate($product_rates_array)
{
$tax_rate = null;
if ($product_rates_array && is_array($product_rates_array) && self::get_options()->get('jigoshop_calc_taxes') == 'yes' && !empty($product_rates_array)) {
$tax_rate = 0;
foreach ($product_rates_array as $tax_class => $value) {
if (jigoshop_product::get_non_compounded_tax($tax_class, $product_rates_array)) {
$tax_rate += round(jigoshop_product::get_product_tax_rate($tax_class, $product_rates_array), 4);
} else {
$tax_rate += round((100 + $tax_rate) * (jigoshop_product::get_product_tax_rate($tax_class, $product_rates_array) / 100), 4);
}
}
}
return $tax_rate;
}
