Code-Snippets-Functions/Execute a function on a child site/WooCommerce/ensure-product-sku-contains-13-digits.txt

function ensure_13_digit_sku( $sku ) {
    return str_pad($sku, 13, '0', STR_PAD_LEFT);
}

add_action('woocommerce_admin_process_product_object', 'pre_process_product_sku');
function pre_process_product_sku( $product ) {
    $sku = isset($_POST['_sku']) ? wc_clean( wp_unslash($_POST['_sku']) ) : '';

    $product->set_sku( ensure_13_digit_sku($sku) );
}

add_action('woocommerce_admin_process_variation_object', 'pre_process_variation_sku');
function pre_process_variation_sku( $variation, $i ) {
    $sku = isset($_POST['variable_sku'][$i]) ? wc_clean( wp_unslash($_POST['variable_sku'][$i]) ) : '';

    $variation->set_sku( ensure_13_digit_sku($sku) );
}