Add cross-sell products to all products in WooCommerce

Add cross-sell products to all products in WooCommerce – no plugin required

To add cross-sell products to all products in WooCommerce using PHP code, follow these steps:

Step 1: Find the Product IDs for Cross-Sell Products

1. Go to WooCommerce > Products:
   • In the WordPress admin panel, navigate to “Products” under “WooCommerce”.
2. Identify Product IDs:
   • On the product list page, you will see a column with the product IDs. If the ID column is not visible, you can identify the product ID by:
     • Editing a product: Click on a product name to go to the edit page. In the URL bar, you will see something like post=123 – the number 123 is the product ID.
     • Product list view: Hover over the product name in the list. The product ID will be displayed in the URL at the bottom of the browser.

Step 2: Use the Product IDs in PHP Code

1. Copy the Product IDs:
   • Note down the IDs of the products you want to add as cross-sell.
2. Customize the PHP Code:
   • Replace the placeholder IDs in the $cross_sells array with your noted product IDs.

Here’s the updated PHP code with a placeholder for product IDs:

function add_cross_sells_to_all_products() {
    $cross_sells = array(123, 456, 789); // Replace with your product IDs for cross-sell
    $args = array(
        'post_type' => 'product',
        'posts_per_page' => -1,
    );

    $loop = new WP_Query($args);

    while ($loop->have_posts()) : $loop->the_post();
        $product_id = get_the_ID();
        update_post_meta($product_id, '_crosssell_ids', $cross_sells);
    endwhile;

    wp_reset_query();
}
add_action('init', 'add_cross_sells_to_all_products');