WooCommerce | Adjust the title of the Shipping Method based if a Shipping Class product is in the Cart

woocommerce-adjust-shipping-title-based-on-shipping-class-in-cart.php

<?php

add_filter('woocommerce_package_rates', 'change_shipping_method_name_based_on_shipping_class', 50, 2);
function change_shipping_method_name_based_on_shipping_class($rates, $package){
	// HERE set the shipping class for "Pickup"
	$shipping_class_id = 125;
	$pickup = false;
	$deliver = false;

	// Check for the "Pickup" shipping class in cart items
	foreach( $package['contents'] as $cart_item ) {
		// if a product has Pickup class, then set this variable to true
		if( $cart_item['data']->get_shipping_class_id() == $shipping_class_id ){
			$pickup = true;
			//break;
		}
		// if a product does NOT have pickup class, then set this variable to true
		if( $cart_item['data']->get_shipping_class_id() !== $shipping_class_id ){
			$deliver = true;
			break;
		}
	}

	// Loop through shipping methods
	foreach ( $rates as $rate_key => $rate ) {
		// Change "Flat rate" Shipping method label name
		if ( 'flat_rate' === $rate->method_id ) {
			// if it had a deliver item then make no mention of pickup
			if($deliver) {
				$rates[$rate_key]->label = __( 'Delivery Rate', 'woocommerce' );
			}
			// otherwise it must have had ONLY pickup items
			elseif($pickup) {
				$rates[$rate_key]->label = __( 'Local Pickup', 'woocommerce' );
			}
			// just in case neither of those ends up being true
			else {
				$rates[$rate_key]->label = __( 'Shipping', 'woocommerce' );
			}
		}
	}
	return $rates;
}