I need to check the cart to see if a specific product attribute has been added on any product. (This is within a custom shipping function hooked into woocommerce_package_rates.)
I have the variant ID for each item in my cart, but I don't know how to get the variant slug for that item...
foreach (WC()->cart->get_cart() as $cart_item) {
// $product_in_cart = $cart_item['product_id'];
$variation_id = $cart_item['variation_id'] > 0 ? $cart_item['variation_id'] :
$cart_item['product_id'];
$variation = wc_get_product($variation_id);
$variation_name = $variation->get_formatted_name(); //I want to get the slug instead.
// if there is the swatch variation of any product in the cart.
if ( $variation_name == 'swatch') $cart_has_swatch = "true";
} 
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You caused some confusion. On WooCommerce Cart Item:
$cart_item['data'];can be accessed via$cart_item['variation'] (this is an array of product attribute taxonomy, product attribute slug value pairs) .$variation->get_formatted_name()is the product variation name (formatted) and therefore is not a variation product attribute.woocommerce_package_ratesfilter hook, use$package['contents']instead ofWC()->cart->get_cart().Your question is not very clear because we don't know if you are searching for the term "sample" in the attribute taxonomy or the attribute segment value.
Try the following:
add_filter( 'woocommerce_package_rates', 'filtering_woocommerce_package_rates', 10, 2 ); function filtering_woocommerce_package_rates( $rates, $package ) { $cart_has_swatch = false; // initializing // Loop through cart items in this shipping package foreach( $package['contents'] as $cart_item ) { // Check for product variation attributes if( ! empty($cart_item['variation']) ) { // Loop through product attributes for this variation foreach( $cart_item['variation'] as $attr_tax => $attr_slug ) { // Check if the world 'swatch' is found if ( strpos($attr_tax, 'swatch') !== false || strpos( strtolower($attr_slug), 'swatch') !== false ) { $cart_has_swatch = true; // 'swatch' found break; // Stop the loop } } } } if ( $cart_has_swatch ) { // Do something } return $rates; }It should work for you.