Add random string to WooCommerce order items based on product SKU

Question

I have set up variable products within WooCommerce.

Each variation has a unique SKU. My mission is to inspect the SKU within the cart, then according to the SKU, generate a number of random strings (16alphanumeric characters).

If item (1) in the cart is SKU 'ABC', then (x) number of unique strings are generated and stored for the respective order.
If item (2) in the cart is SKU 'DEF', then (y) number of unique strings are generated and stored for the respective order.

I have had a look at woocommerce_add_order_item_meta hook but I can't seem to be able to access the item product data within the function I create associated with this hook?

I am now using

add_action( 'woocommerce_add_order_item_meta', 'experiment_add_order_item_meta', 10, 3 );
function experiment_add_order_item_meta( $item_id, $values, $cart_item_key  ) {
    // Get a product custom field value
    $custom_field_value = 'hithere';

    // Update order item meta
    if ( ! empty( $custom_field_value ) ){
        wc_add_order_item_meta( $item_id, 'meta_key1', $custom_field_value, false );
    }
}

But I am lost trying to get the product SKU from this point. I cannot var_dump() within the function to see the $values etc?

7uc1f3r · Accepted Answer · 2021-05-17T18:05:41.533

Explanation / functions used

woocommerce_add_order_item_meta hook is deprecated since WooCommerce 3. Use woocommerce_checkout_create_order_line_item instead
WC_Product::get_sku( $context ); - Get SKU (Stock-keeping unit) – product unique ID.
See PHP random string generator for different options. I used https://stackoverflow.com/a/13212994/11987538 anser code.

So you get:

function generate_random_string( $length = 16 ) {
    return substr( str_shuffle( str_repeat( $x = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ', ceil( $length / strlen( $x ) ) ) ), 1, $length );
}
 
function action_woocommerce_checkout_create_order_line_item( $item, $cart_item_key, $values, $order ) {
    // The WC_Product instance Object
    $product = $item->get_product();
    
    // Get product SKU
    $product_sku = $product->get_sku();
    
    // Generate random string
    $random_string = generate_random_string();
    
    // Compare
    if ( $product_sku == 'ABC' ) {
        $item->update_meta_data( '_random_string', $random_string );
    } elseif ( $product_sku == 'DEF' ) {
        $item->update_meta_data( '_random_string', $random_string );        
    } elseif ( $product_sku == 'GHI' ) {
        $item->update_meta_data( '_random_string', $random_string );        
    } else {
        $item->update_meta_data( '_random_string', $random_string );
    }   
}
add_action( 'woocommerce_checkout_create_order_line_item', 'action_woocommerce_checkout_create_order_line_item', 10, 4 );

Add random string to WooCommerce order items based on product SKU

1 Answers1