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add_action( 'woocommerce_add_to_cart_validation', function( $is_allow, $product_id, $quantity ) { $product = get_post( $product_id ); $product_author = $product->post_author; //Iterating through each cart item foreach ( WC()->cart->get_cart() as $cart_item_key => $cart_item ) { $cart_product_id = $cart_item['product_id']; $cart_product = get_post( $cart_product_id ); $cart_product_author = $cart_product->post_author; if( $cart_product_author != $product_author ) { $is_allow = false; break; } } if( !$is_allow ){ // We display an error message wc_clear_notices(); wc_add_notice( __( "You already have products of a different seller in cart. You can only purchase from one seller at a time.", "marketking" ), 'error' ); } return $is_allow; }, 50, 3 );