WooCommerce: Hide the undesired method for the particular existing shipping class

functions.php

	add_filter('woocommerce_package_rates', 'hide_auspost_method_when_shipping_class_product_is_in_cart', 10, 2);
	
	function hide_auspost_method_when_shipping_class_product_is_in_cart($available_shipping_methods, $package)
	{
		$shipping_class_ids = array(
			16
		);
		$shipping_services_to_hide = array(
			'wf_australia_post:AUS_PARCEL_REGULAR',
			'wf_australia_post:AUS_PARCEL_EXPRESS',
			'wf_australia_post:AUS_PARCEL_COURIER',
			'wf_australia_post:INTL_SERVICE_EPI',
			'wf_australia_post:INTL_SERVICE_ECI_PLATINUM',
			'wf_australia_post:INTL_SERVICE_ECI_M',
			'wf_australia_post:INTL_SERVICE_RPI',
			'wf_australia_post:INTL_SERVICE_PTI',
			'wf_australia_post:INTL_SERVICE_AIR_MAIL',
			'wf_australia_post:INTL_SERVICE_SEA_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;
	}