WooCommerce + Groups: Remove Specific Disallowed Items From Cart

• Restrict a list of SKUs from being purchased by a specific group

The site uses the Force Sells Extension from WooThemes, but the plugin isn’t required to use the below code. The SKUs listed in the original from below were part of a larger grouped product and individual non-display wasn’t possible through the UI.

• WooCommerce
• Groups

<?php
$group_num  =  <GROUP_ID>;
$disallowed_product_skus  =  array (
    $group_num    =>  array (
        '<SKU>',
        )
);
 
add_filter ( 'woocommerce_before_cart' , 'cart_check_disallowed_skus' );
function cart_check_disallowed_skus() {
 
  if ( is_cart( ) ) {
    global $woocommerce;
    global $disallowed_product_skus;
 
    $user_id = get_current_user_id();
    $user = new Groups_User( $user_id );
    $groups = $user->groups;
    $assigned_group = $groups[0]->group->group_id;
 
    $cart_contents = $woocommerce->cart->get_cart();
    $cart_keys = array_keys ( $cart_contents );
 
    if ( array_key_exists ( $assigned_group , $disallowed_product_skus ) ) {
        $disallowed_products_in_cart  =  false;
        foreach ( $cart_keys as $key ) {
            $cart_item_product_id = $cart_contents[$key]['product_id'];
            $cart_product_meta = get_post_meta ( $cart_item_product_id );
            $cart_product_sku = $cart_product_meta['_sku'][0];
 
            if ( in_array ( $cart_product_sku , $disallowed_product_skus[$assigned_group] ) ) {
                // Set quantity to zero if the product is in the disallowed list
                $woocommerce->cart->set_quantity ( $key , 0 , true );
                $disallowed_products_in_cart = true;
            }
        }
 
        if ( $disallowed_products_in_cart ) {
            echo '<p class="woocommerce-error">Non-approved products have been automatically removed from cart.</p>';  
        }
    }
  }
}
?>