/** * Change the add to cart text on single product pages when product added */ add_filter('woocommerce_product_single_add_to_cart_text', 'cc_custom_cart_button_text'); function cc_custom_cart_button_text() { global $woocommerce; foreach($woocommerce->cart->get_cart() as $cart_item_key => $values ) { $_product = $values['data']; if( get_the_ID() == $_product->id ) { return __('Already in cart - add again?', 'classic-commerce'); } } return __('Add to cart', 'classic-commerce'); }