Save custom post meta into attributes and set by default multiple attribute term into the product - Woocommerce

Save custom post meta into attributes and set by default multiple attribute term into the product - Woocommerce.php

<?

/*
 * Save custom post meta into attributes and set by default multiple attribute term into the product - Woocommerce
*/

function update_post_meta_subito($product_id)
{

    $taxonomy = 'pa_brand'; // The taxonomy
    $term_name = get_post_meta($product_id, 'meta_product_producer', true); // Custom post meta
   // $term_slug = sanitize_title($term_name); // The term "slug"
    $term_id = $term_name;

    // get an instance of the WC_Product Object
    $product = wc_get_product($product_id);
    $attributes = (array)$product->get_attributes();

    // 1. If the product attribute is set for the product
    if (array_key_exists($taxonomy, $attributes))
    {
        foreach ($attributes as $key => $attribute)
        {
            if ($key == $taxonomy)
            {
                $options = (array)$attribute->get_options();
                $options[] = $term_id;
                $attribute->set_options($options);
                $attributes[$key] = $attribute;
                break;
            }
        }
        $product->set_attributes($attributes);
    }
    // 2. The product attribute is not set for the product
    else
    {
        $attribute = new WC_Product_Attribute();
        $attribute->set_id(sizeof($attributes) + 1);
        $attribute->set_name($taxonomy);
        $attribute->set_options(array(
            $term_id
        ));
        $attribute->set_position(sizeof($attributes) + 1);
        $attribute->set_visible(true);
        $attribute->set_variation(false);
        $attributes[] = $attribute;

        $product->set_attributes($attributes);
    }

    //If calling wp_update_post, unhook this function so it doesn't loop infinitely
    remove_action('woocommerce_update_product', 'update_post_meta_subito', 99, 1);
    // Save
    $product->save();
    // re-hook this function
    add_action('woocommerce_update_product', 'update_post_meta_subito', 99, 1);
    // Append the new term in the product
    if (!has_term($term_name, $taxonomy, $product_id)) wp_set_object_terms($product_id,/* $term_slug,*/ $taxonomy, true);

}

add_action('woocommerce_update_product', 'update_post_meta_subito', 99, 1);

/* --- */