Dodawanie kilku produktów jednocześnie do koszyka

Woocommerce pozwala na wygenerowanie linka do strony kasy koszyka, który automatycznie dodaje produkt do koszyka. Działa to niestety tylko dla jednego produktu. Możemy utworzyć przykładowe łącze:

$product_id = 10;
$url = esc_url_raw( add_query_arg( 'add-to-cart', $product_id, wc_get_checkout_url() ) );

Niestety nie ma prostego sposobu by w ten sposób dodać kilka produktów.
Poniższy kod pozwoli za pomocą jednego linka dodać kilka identyfikatorów produktów oddzielonych przecinkami:

function woocommerce_maybe_add_multiple_products_to_cart( $url = false ) {
	// Make sure WC is installed, and add-to-cart qauery arg exists, and contains at least one comma.
	if ( ! class_exists( 'WC_Form_Handler' ) || empty( $_REQUEST['add-to-cart'] ) || false === strpos( $_REQUEST['add-to-cart'], ',' ) ) {
		return;
	}

	// Remove WooCommerce's hook, as it's useless (doesn't handle multiple products).
	remove_action( 'wp_loaded', array( 'WC_Form_Handler', 'add_to_cart_action' ), 20 );

	$product_ids = explode( ',', $_REQUEST['add-to-cart'] );
	$count       = count( $product_ids );
	$number      = 0;

	foreach ( $product_ids as $id_and_quantity ) {
		// Check for quantities defined in curie notation (<product_id>:<product_quantity>)
		
		$id_and_quantity = explode( ':', $id_and_quantity );
		$product_id = $id_and_quantity[0];

		$_REQUEST['quantity'] = ! empty( $id_and_quantity[1] ) ? absint( $id_and_quantity[1] ) : 1;

		if ( ++$number === $count ) {
			// Ok, final item, let's send it back to woocommerce's add_to_cart_action method for handling.
			$_REQUEST['add-to-cart'] = $product_id;

			return WC_Form_Handler::add_to_cart_action( $url );
		}

		$product_id        = apply_filters( 'woocommerce_add_to_cart_product_id', absint( $product_id ) );
		$was_added_to_cart = false;
		$adding_to_cart    = wc_get_product( $product_id );

		if ( ! $adding_to_cart ) {
			continue;
		}

		$add_to_cart_handler = apply_filters( 'woocommerce_add_to_cart_handler', $adding_to_cart->get_type(), $adding_to_cart );

		// Variable product handling
		if ( 'variable' === $add_to_cart_handler ) {
			woo_hack_invoke_private_method( 'WC_Form_Handler', 'add_to_cart_handler_variable', $product_id );

		// Grouped Products
		} elseif ( 'grouped' === $add_to_cart_handler ) {
			woo_hack_invoke_private_method( 'WC_Form_Handler', 'add_to_cart_handler_grouped', $product_id );

		// Custom Handler
		} elseif ( has_action( 'woocommerce_add_to_cart_handler_' . $add_to_cart_handler ) ){
			do_action( 'woocommerce_add_to_cart_handler_' . $add_to_cart_handler, $url );

		// Simple Products
		} else {
			woo_hack_invoke_private_method( 'WC_Form_Handler', 'add_to_cart_handler_simple', $product_id );
		}
	}
}

// Fire before the WC_Form_Handler::add_to_cart_action callback.
add_action( 'wp_loaded', 'woocommerce_maybe_add_multiple_products_to_cart', 15 );

function woo_hack_invoke_private_method( $class_name, $methodName ) {
	if ( version_compare( phpversion(), '5.3', '<' ) ) { throw new Exception( 'PHP version does not support ReflectionClass::setAccessible()', __LINE__ ); } $args = func_get_args(); unset( $args[0], $args[1] ); $reflection = new ReflectionClass( $class_name ); $method = $reflection->getMethod( $methodName );
	$method->setAccessible( true );

	$args = array_merge( array( $class_name ), $args );
	return call_user_func_array( array( $method, 'invoke' ), $args );
}

Kilka produktów z ilościami:

$product_ids = '63833:2,221916:4';
$add_to_cart_url = esc_url_raw( add_query_arg( 'add-to-cart', $product_ids, wc_get_checkout_url() ) );

Dwa produkty po jednej sztuce

$product_ids = '63833,221916';
$add_to_cart_url = esc_url_raw( add_query_arg( 'add-to-cart', $product_ids, wc_get_checkout_url() ) );

Normalnie jeden produkt

$product_ids = '63833';
$add_to_cart_url = esc_url_raw( add_query_arg( 'add-to-cart', $product_ids, wc_get_checkout_url() ) );