Code-Snippets-Functions/Execute a function on a child site/WooCommerce/change-add-to-cart-button-text-if-product-is-in-cart.txt

function change_add_to_cart_text_if_product_already_in_cart( $add_to_cart_text, $product ) {    
    if ( WC()->cart ) {
        $cart = WC()->cart; // Get cart
        if ( ! $cart->is_empty() ) {
            foreach ( $cart->get_cart() as $cart_item_key => $cart_item ) {
                $_product_id = $cart_item['product_id'];
                if ( $product->get_id() == $_product_id ) {
                    $add_to_cart_text = '('.$cart_item['quantity'].')'.' Already in cart';
                    break;
                }
            }
        }
    }
    return $add_to_cart_text;
}
add_filter( 'woocommerce_product_add_to_cart_text', 'change_add_to_cart_text_if_product_already_in_cart', 10, 2 );
add_filter( 'woocommerce_product_single_add_to_cart_text', 'change_add_to_cart_text_if_product_already_in_cart', 10, 2 );