Filtering specific product ID in WooCommerce Order items

Question

I have a function that is generating a unique string. This is currently working. However it is running for all products that are sold at checkout. I would like the following function to only run if a specific product is in the order Items.

Here is what I have so far:

add_action( 'woocommerce_order_status_processing', 'add_unique_id' );

function add_unique_id($order_id) {
    $order = new WC_Order( $order_id );
    $items = $order->get_items(); 
    foreach ($items as $item_id => $product ) {
        $str = "";
        $length= 45;
$characters = array_merge(range('A','Z'), range('a','z'), range('0','9'));
$max = count($characters) - 1;
    for ($i = 0; $i < $length; $i++) {
    $rand = mt_rand(0, $max);
    $str .= $characters[$rand];
    }
      wc_add_order_item_meta($item_id, 'Member Number', $str);
    }
}

LoicTheAztec LoicTheAztec · Accepted Answer · 2017-08-04T17:27:48

Updated (for product category)

This function is not working in cart or Checkout, but after submission when order has been generated.

I have changed your code a little bit to allow this generation code only for a defined product ID or a product category (that you will need to set inside the function):

add_action( 'woocommerce_order_status_processing', 'add_unique_id', 10, 1 );
function add_unique_id( $order_id ) {
    $order = wc_get_order( $order_id );
    foreach ($order->get_items() as $item_id => $item_obj ) {

        // HERE set YOUR targeted product ID
        $targeted_product_id = 0; // 0 value make it work only for product category (below)

        // HERE set YOUR product category (ID, slug or name… Or an array of values)
        $category = 'memberships'; 

        // If the targeted product ID or the product category is found in the order items.
        if( $item_obj->get_product_id() == $targeted_product_id || has_term( $category,'product_cat', $item_obj->get_product_id() ) ) {

            $str = "";
            $length= 45;
            $characters = array_merge(range('A','Z'), range('a','z'), range('0','9'));
            $max = count($characters) - 1;
            for ($i = 0; $i < $length; $i++) {
                $rand = mt_rand(0, $max);
                $str .= $characters[$rand];
            }
            wc_add_order_item_meta( $item_id, 'Member Number', $str );
        }
    }
}

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 for WooCommerce version 3+

So your unique "Member number" will be generated only for order items that are matching with the targeted product ID or the product category.

Filtering specific product ID in WooCommerce Order items

1 Answers