Disabling the free shipping method when the cart has product/s which assigned a certain shipping class

Can you please tell me how can I adapt this snippet (it disables the free shipping method for a certain product) to make it possible to disable the free shipping method when the cart has product/s which assigned a certain shipping class? (WooCommerce 4.2+)

Any help appreciated. Thanks.

function my_free_shipping( $is_available ) {
    global $woocommerce;

    // set the product ids that are ineligible
    $ineligible = array( '4743' );

    // get cart contents
    $cart_items = $woocommerce->cart->get_cart();
    
    // loop through the items looking for one in the ineligible array
    foreach ( $cart_items as $key => $item ) {
        if( in_array( $item['product_id'], $ineligible ) ) {
            return false;
        }
    }

    // nothing found return the default value
    return $is_available;
}
add_filter( 'woocommerce_shipping_free_shipping_is_available', 'my_free_shipping', 20 );

Answers:

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Method 1

Try this:

function hide_shipping_methods( $available_shipping_methods, $package ) {
    $shipping_classes = array( 'some-shipping-class-1', 'some-shipping-class-2' );
    $excluded_methods = array( 'free_shipping' );
    $shipping_class_exists = false;
    foreach( $package['contents'] as $key => $value )
        if ( in_array( $value['data']->get_shipping_class(), $shipping_classes ) ) {
            $shipping_class_exists = true;
            break;
        }
    if ( $shipping_class_exists ) {
        $methods_to_exclude = array();
        foreach( $available_shipping_methods as $method => $method_obj )
            if ( in_array( $method_obj->method_id, $excluded_methods ) )
                $methods_to_exclude[] = $method;
        if ( $methods_to_exclude )
            foreach ( $methods_to_exclude as $method )
                unset( $available_shipping_methods[$method] );
    }
    return $available_shipping_methods;
}
add_filter( 'woocommerce_package_rates', 'hide_shipping_methods', 10, 2 );

Here $shipping_classes is array of the shipping classes slugs and $excluded_methods is array of excluded shipping methods if at least one of the products in the cart belongs to one of these shipping classes.

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