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Woocommerce Add filter when Add to Cart

Trying to add a filter when a customer adds a product to the cart, to allow it or not. We just need to compare one attribute of the Woocommerce products. If cart is empty : Add to cart ok If cart has 1 or more items : check Attribute XXX value of products If Attribute value is the same : Add to cart ok If Attribute value is different : Add to cart denied and message will display

I have this code so far, but it doesn't work well at all, and I'm unsure why...

// Check Products added to cart for same vendor
function so_validate_add_cart_item( $passed, $product_id ) {

  global $woocommerce;
  $items = $woocommerce->cart->get_cart();

  foreach($items as $item => $values)
        {
          $_product =  wc_get_product( $values['data']->get_id());
          $prod1_vendeur[] = $_product->get_attribute( 'pa_vendeur' );
        }

  $newproduct = wc_get_product( $product_id );
  $prod2_vendeur = $newproduct->get_attribute( 'pa_vendeur' );

  if (isset($prod1_vendeur ))
  {
    if ( $prod1_vendeur[0] != $prod2_vendeur )
      {
        $passed = false;
        wc_add_notice( 'Error message' , 'notice' );
      }
  }
  return $passed;
}
add_filter( 'woocommerce_add_to_cart_validation', 'so_validate_add_cart_item', 10, 5 );```
Any help is more than appreciated.


source https://stackoverflow.com/questions/68154137/woocommerce-add-filter-when-add-to-cart
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