Append WooCommerce Product SKU to Short Description (including multiple variations)

append-me.php

// ADD SKUS
// Runs on update - use Quick Edit

function ni_append_sku_to_short_description($post_id) {
    if ('product' !== get_post_type($post_id)) {
        return;
    }

    $product = wc_get_product($post_id);

    if (!$product) {
        return;
    }

    $short_desc = $product->get_short_description();

    // List to hold all SKUs
    $skus = [];

    // Check if the product is variable
    if ($product->is_type('variable')) {
        $variations = $product->get_available_variations();
        foreach ($variations as $variation) {
            if (isset($variation['sku']) && $variation['sku']) {
                $skus[] = $variation['sku'];
            }
        }
    } else {
        $sku = $product->get_sku();
        if ($sku) {
            $skus[] = $sku;
        }
    }

    // If there are no SKUs to append, return
    if (empty($skus)) {
        return;
    }

    // Combine SKUs and check if they're already appended to the short description
    $combined_sku_string = "SKU: " . implode(', ', $skus);

    if (strpos($short_desc, $combined_sku_string) !== false) {
        return;
    }

    $updated_desc = $short_desc . "<p>" . $combined_sku_string . "</p>";

    // Bypass save_post action to prevent infinite loop
    remove_action('save_post', 'append_sku_to_short_description');

    wp_update_post([
        'ID'           => $post_id,
        'post_excerpt' => $updated_desc,  // Short description is stored as post_excerpt in WP
    ]);

    // Re-add the action
    add_action('save_post', 'append_sku_to_short_description');
}

add_action('save_post', 'ni_append_sku_to_short_description');