$block_data['sku'] = $product->get_sku();

$layout['sku'] = array();

$block_data['content'] = get_the_content();
$block_data['classes'] = $block_classes;
$block_data['tmb_data'] = $tmb_data;
$block_data['id'] = $post->ID;
$block_data['media_id'] = $item_thumb_id;
$block_data['title_classes'] = $title_classes;
$block_data['link'] = get_permalink();
$block_data['text_length'] = 300;
$block_data['product'] = true;
$block_data['sku'] = $product->get_sku();

$categories_id = array();
$categories_link = array();
$woo_categories = get_the_terms( $post->ID, 'product_cat' );
if (isset($woo_categories) && !empty($woo_categories)) {
    foreach ( $woo_categories as $woo_cat ) {
        $woo_cat_id = $woo_cat->term_id; //category ID
        $woo_cat_name = $woo_cat->name; //category name



$block_data['single_categories_id'] = $categories_id;
$block_data['single_categories'] = $categories_link;


if ($item_thumb_id !== '') {
    $layout['media'] = array();

} else {
    $layout['media'] = array('placeholder');

}
$layout['title'] = array();
$layout['price'] = array();
$layout['sku'] = array();

function woocommerce_item_sku_on_archive()  {
    global $product;
    if ( $product->get_sku() ) {
        echo $product->get_sku();
    }
}
add_action( 'woocommerce_after_shop_loop_item_title', 'woocommerce_item_sku_on_archive');