Hiding shipping method according to shipping class

I found this code and I’m using it to hide the cheapest shipping method when any product from a certain shipping class is in the cart. This worked so far, but the exception was only 1 shipping class.

Now I wanted to add 2 more shipping classes to the mandatory list, and it doesn’t work. Only the first named class slug is recognized. Is there a way to workaround this?

The goal is to hide shipping method “flat_rate:2” when any product from any of the 3 shipping classes is added to the cart: shipping class slugs “caixa”, “trajes” and “kits”.

The code is this:

add_filter( 'woocommerce_package_rates', 'hide_shipping_method_based_on_shipping_class', 10, 2 );
function hide_shipping_method_based_on_shipping_class( $rates, $package )
{
    if ( is_admin() && ! defined( 'DOING_AJAX' ) )
        return;

    // HERE define your shipping class SLUG
    $class_slug = 'large';

    // HERE define the shipping method to hide
    $method_key_id = 'flat_rate:7';

    // Checking in cart items
    foreach( WC()->cart->get_cart() as $cart_item ){
        // If we find the shipping class
        if( $cart_item['data']->get_shipping_class() == $class_slug ){
            unset($rates[$method_key_id]); // Remove the targeted method
            break; // Stop the loop
        }
    }
    return $rates;
}

Cheers

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