The below code will enable “Free shipping” for applied coupons only if cart subtotal reaches a minimal amount (discounted including taxes):
add_filter( 'woocommerce_package_rates', 'coupons_removes_free_shipping', 10, 2 );
function coupons_removes_free_shipping( $rates, $package ){
if ( is_admin() && ! defined( 'DOING_AJAX' ) )
return $rates;
$min_subtotal = 250; // Minimal subtotal allowing free shipping
// Get needed cart subtotals
$subtotal_excl_tax = WC()->cart->get_subtotal();
$subtotal_incl_tax = $subtotal_excl_tax + WC()->cart->get_subtotal_tax();
$discount_excl_tax = WC()->cart->get_discount_total();
$discount_incl_tax = $discount_total + WC()->cart->get_discount_tax();
// Calculating the discounted subtotal including taxes
$discounted_subtotal_incl_taxes = $subtotal_incl_tax - $discount_incl_tax;
$applied_coupons = WC()->cart->get_applied_coupons();
if( sizeof($applied_coupons) > 0 && $discounted_subtotal_incl_taxes < $min_subtotal ){
foreach ( $rates as $rate_key => $rate ){
// Targeting "Free shipping"
if( 'free_shipping' === $rate->method_id ){
unset($rates[$rate_key]);
}
}
}
return $rates;
}
Code goes in function.php file of your active child theme (or active theme). Tested and work.
Original answer:
The below code will remove “Free shipping” shipping methods when any coupon is applied without any settings need. There is some mistakes in your actual code. Try the following:
add_filter( 'woocommerce_package_rates', 'coupons_removes_free_shipping', 10, 2 );
function coupons_removes_free_shipping( $rates, $package ){
if ( is_admin() && ! defined( 'DOING_AJAX' ) )
return $rates;
$applied_coupons = WC()->cart->get_applied_coupons();
if( sizeof($applied_coupons) > 0 ){
// Loop through shipping rates
foreach ( $rates as $rate_key => $rate ){
// Targeting "Free shipping" only
if( 'free_shipping' === $rate->method_id ){
unset($rates[$rate_key]); // Removing current method
}
}
}
return $rates;
}
Code goes in function.php file of your active child theme (or active theme). Tested and works.