Don't allow specific product quantities in the cart

Question

We want the customers to only purchase the following quantities.

• 1 Bag
• 2 Bags
• 3 Bags
• 4 Bags
• 5 Bags
• 10 Bags

So, far; we've successfully managed to limit the number of quantities, that can be selected on the single product page,

We're currently using the following code to limit the user to a total of 10 Bags.

// Checking and validating when products are added to cart
add_filter( 'woocommerce_add_to_cart_validation', 'only_six_items_allowed_add_to_cart', 10, 3 );

function only_six_items_allowed_add_to_cart( $passed, $product_id, $quantity ) {

$cart_items_count = WC()->cart->get_cart_contents_count();
$total_count = $cart_items_count + $quantity;

if( $cart_items_count >= 10 || $total_count > 10 ){
    // Set to false
    $passed = false;
    // Display a message
     wc_add_notice( __( "Sorry, You can’t have more than 10 bags in your cart.", "woocommerce" ), 
"error" );
}
return $passed;
}

Now, we just need to add a condition, which will limit the user (and display a warning), whenever they try to increase their cart quantity, between the range of 6-9 bags.

The problem is that, for example, a customer adds 5 bags to their cart and after that, what if they go back and try to add another bag?

I want to avoid this situation, so the customer is only able to purchase the above-mentioned quantities.

Please check this link to better understand the situation: https://mettaatta.com/product/metta-atta

Answer 1

This one :

if($cart_items_count >= 10 || $total_count > 10 ){
    // Display a message
}
if($total_count >=6 && $total_count <=9){
   // Display a message
}

Will work as you need.

EDIT

If you want to combine them :

if(($cart_items_count >= 10 || $total_count > 10) || ($total_count >=6 && $total_count <=9)){
   // Display a message
}