WooCommerce: Allow adding multiple products to the cart via the add-to-cart query string

If you’re not familiar, WooCommerce offers a way to link to the checkout/cart page and automatically add a product to the cart (h/t Justin). You can create a link like so:

$product_id = 55;
$url = esc_url_raw( add_query_arg( 'add-to-cart', $product_id, wc_get_checkout_url() ) );

I recently (somewhat annoyingly) discovered that while that works fairly well, there was no way to do this for multiple products. So I’ve created a snippet that will allow you to do so by adding a comma-separated list of products ids:

function woocommerce_maybe_add_multiple_products_to_cart() {
    // 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 $product_id ) {
        if ( ++$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();
        }

        $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->product_type, $adding_to_cart );

        /*
         * Sorry.. if you want non-simple products, you're on your own.
         *
         * Related: WooCommerce has set the following methods as private:
         * WC_Form_Handler::add_to_cart_handler_variable(),
         * WC_Form_Handler::add_to_cart_handler_grouped(),
         * WC_Form_Handler::add_to_cart_handler_simple()
         *
         * Why you gotta be like that WooCommerce?
         */
        if ( 'simple' !== $add_to_cart_handler ) {
            continue;
        }

        // For now, quantity applies to all products.. This could be changed easily enough, but I didn't need this feature.
        $quantity          = empty( $_REQUEST['quantity'] ) ? 1 : wc_stock_amount( $_REQUEST['quantity'] );
        $passed_validation = apply_filters( 'woocommerce_add_to_cart_validation', true, $product_id, $quantity );

        if ( $passed_validation && false !== WC()->cart->add_to_cart( $product_id, $quantity ) ) {
            wc_add_to_cart_message( array( $product_id => $quantity ), true );
        }
    }
}

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

Now you can get the cart url for multiple products like so:

$product_ids = implode( ',', array( 1, 2, 55 ) );
$url = esc_url_raw( add_query_arg( 'add-to-cart', $product_ids, wc_get_checkout_url() ) );

4 Comments on “WooCommerce: Allow adding multiple products to the cart via the add-to-cart query string

  1. Hi, Thanks for the code. Can you please share a code for variable products also? Thanks

  2. Like this: 3072&variation_id=3083&attribute_pa_yuzukolcusu=09&quantity=3,3072&variation_id=3082&attribute_pa_yuzukolcusu=11&quantity=3

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