WooCommerce: Hide a shipping method for a particular Shipping Class

functions.php

	add_filter('woocommerce_package_rates', 'hide_shipping_method_when_shipping_class_product_is_in_cart', 10, 2);
	
	function hide_shipping_method_when_shipping_class_product_is_in_cart($available_shipping_methods, $package)
	{
	
		// Shipping class IDs that need the method removed
	
		$shipping_class_ids = array(
			1111,
			2232,
			4235
		);
		$shipping_services_to_hide = array(
			'wf_shipping_usps:D_PRIORITY_MAIL',
			'wf_shipping_usps:D_EXPRESS_MAIL',
			'wf_shipping_usps:D_MEDIA_MAIL'
		);
		$shipping_class_exists = false;
		foreach(WC()->cart->cart_contents as $key => $values) {
			if (in_array($values['data']->get_shipping_class_id() , $shipping_class_ids)) {
				$shipping_class_exists = true;
				break;
			}
		}
	
		if ($shipping_class_exists) {
			foreach($shipping_services_to_hide as & $value) {
				unset($available_shipping_methods[$value]);
			}
		}
	
		return $available_shipping_methods;
	}