Get product variation's SKU

Question

I need to e-mail different information to my customers depending on SKU of a products they purchased. The problem is that my products have variations, and each variation has it's own SKU.

I know how to loop through client's order items and get a products SKU...

// Loop through order items
foreach ( $order->get_items() as $item_id => $item ) {
  // Get product ID
  $product_id = $item->get_product_id(); 

  // Get an instance of Product object
  $item->get_product(); 

  // Get SKU
  $sku = $product->get_sku();

  echo $sku;
}

But this code shows SKU of the "original" product, not it's variation:(

Answer 1

This should get what you need:

foreach ( $order->get_items() as $item_id => $item ) {
  // Get product ID
  $product_id = $item->get_product_id(); 

  $args = array(
    'post_type'     => 'product_variation',
    'post_status'   => array( 'private', 'publish' ),
    'numberposts'   => -1,
    'orderby'       => 'menu_order',
    'order'         => 'asc',
    'post_parent'   => $product_id
    );

    $variations = get_posts( $args );

    foreach ( $variations as $variation ) {

       // get variation ID
       $variation_ID = $variation->ID;

       // get variations meta
       $product_variation = new WC_Product_Variation( $variation_ID );

       // get variation featured image
       $variation_sku = $product_variation->get_sku();

    }
}

Answer 2

OK, that was all about my inattentiveness... The code worked fine but the test product's variation had no individual SKU, that's why always got the parent's SKU.