Conditionally set cart item prices for specific products in WooCommerce 3

Question

In WooCommerce I am using some code from this answer:
Set WooCommerce cart item price to zero if the product has already been bought

It works great with one product, but I would like to make it work with several products.

So the code below, for a specific product, change the cart item price to $0.00 if customer has already purchased and if not the price is set to $100 (for the first purchase):

    add_action( 'woocommerce_before_calculate_totals', 'conditionally_change_cart_items_price', 10, 1 );
function conditionally_change_cart_items_price( $cart_object ) {

    if ( is_admin() && ! defined( 'DOING_AJAX' ) )
        return;


    $targeted_product_id = 1107;

    // Set Here your custom price (1st purshase)
    $custom_price = 100; // First purshase for product ID 1092

    // Detecting if customer has already bought The targeted product (1092)
    if( is_user_logged_in() ){
        $customer      = wp_get_current_user();
        $customer_id   = $customer->ID; // customer ID
        $customer_email = $customer->email; // customer email

        if( wc_customer_bought_product( $customer_email, $customer_id, $targeted_product_id) )
            $custom_price = 0; // Set to 0 for other purchases (product ID 1092)
    }

    foreach ( $cart_object->get_cart() as $cart_item ) {
        // When targeted product is in cart we change the price
        if ( $cart_item['product_id'] == $targeted_product_id ) {
            // Woocommerce 3+ compatibility
            if ( version_compare( WC_VERSION, '3.0', '<' ) )
                $cart_item['data']->price = $custom_price;
            else
                $cart_item['data']->set_price( $custom_price );
        }
    }
}

How could I make it work for multiple defined products (instead of one actually)?

Answer 1

You have to create an array with all target product ids and then you should check if a customer bought this product already in the foreach loop:

add_action( 'woocommerce_before_calculate_totals', 'conditionally_change_cart_items_price', 10, 1 );

function conditionally_change_cart_items_price( $cart_object ) {
    if ( is_admin() && ! defined( 'DOING_AJAX' ) )
        return;

    // add as many ids as you need
    $targeted_product_ids = array( 1107, 1108, 1109 );

    // Set Here your custom price (1st purshase)
    $custom_price = 100; // First purshase for target product


    if ( is_user_logged_in() ) {
        $customer       = wp_get_current_user();
        $customer_id    = $customer->ID; // customer ID
        $customer_email = $customer->email; // customer email

        foreach ( $cart_object->get_cart() as $cart_item ) {
            // When targeted product is in cart we change the price
            if ( in_array( $cart_item['product_id'], $targeted_product_ids ) ) {

                // Detecting if customer has already bought The targeted product
                if ( wc_customer_bought_product( $customer_email, $customer_id, $targeted_product_id ) )
                    // Set to 0 for other purchases
                    $custom_price = 0;

                // Woocommerce 3+ compatibility
                if ( version_compare( WC_VERSION, '3.0', '<' ) )
                    $cart_item['data']->price = $custom_price;
                else
                    $cart_item['data']->set_price( $custom_price );
            }
        }
    }
}

Answer 2

Based on: Set Woocommerce cart item price to zero if the product has already been bought

You will be able to make it work for multiple defined products IDs (in an array) this way:

// For WooCommerce version 3 and above (only)
add_action( 'woocommerce_before_calculate_totals', 'conditionally_change_cart_items_prices', 10, 1 );
function conditionally_change_cart_items_prices( $cart ) {
    if ( is_admin() && ! defined( 'DOING_AJAX' ) ) 
        return;

    if ( did_action( 'woocommerce_before_calculate_totals' ) >= 2 )
        return;

    // Set HERE the Products to check in this array
    $targeted_product_ids = array( 37, 50, 89, 124, 327 );
    $products_bought = array();

    // Set Here your custom price (1st purshase)
    $custom_price1 = 100; // First purshase
    // Set Here your custom price (more purshases than first)
    $custom_price2 = 0; // Next purshases

    // Detecting if customer has already bought our targeted products
    if( is_user_logged_in() ){
        $customer      = wp_get_current_user();
        $customer_id   = $customer->ID; // customer ID
        $customer_email = $customer->email; // customer email

        // Checking each product in the array
        foreach( $targeted_product_ids as $product_id ){
            if( wc_customer_bought_product( $customer_email, $customer_id, $product_id) ){
                // We set all (targeted) purchased products in an array
                $products_purchased[] = $product_id;
            }
        }
    }

    // Checking cart items and changing item prices if needed
    foreach ( $cart->get_cart() as $cart_item ) {
        // When a targeted products already purchased is in cart we set price 2
        if ( in_array( $cart_item['product_id'], $products_purchased ) ) {
            $cart_item['data']->set_price( $custom_price2 );
        } 
        // When a targeted products is in cart and has not been purchased we set price 1
        elseif ( in_array( $cart_item['product_id'], $targeted_product_ids ) ) {
            $cart_item['data']->set_price( $custom_price1 );
        }
    }
}

Code goes in function.php file of your active child theme (or theme) or also in any plugin file.

This code is tested and works in WooCommerce 3+