In WooCommerce, Looking for code by which you can check Product that you going to ADD to CART already exist in Cart or not ?
By Below code you can check whether an item has already been added to your WooCommerce cart or not ?
# $product_id is ID for product which you going to Add to Cart global $woocommerce; foreach($woocommerce->cart->get_cart() as $key => $val ) { $_product = $val['data']; if($product_id == $_product->id ) { return true; } } return false;
With use of above code you can implement login like it same Product already exist in Cart than instead of adding more time or showing Error / Warning Message specially for a digital products redirect them to Cart Or Checkout page.
function is_product_in_same_cat($valid, $product_id, $quantity) { global $woocommerce; //if($woocommerce->cart->cart_contents_count == 0){ return true;} if($woocommerce->cart->cart_contents_count > 0){ foreach($woocommerce->cart->get_cart() as $key => $val ) { $_product = $val['data']; if($product_id == $_product->id ) { $url = WC()->cart->get_checkout_url(); wp_redirect($url); exit; } } } return $valid; } add_filter( 'woocommerce_add_to_cart_validation', 'is_product_in_same_cat',11,3);