问在Woocommerce中限制购物车项目的数量

EN

// 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 >= 6 || $total_count > 6 ){
        // Set to false
        $passed = false;
        // Display a message
         wc_add_notice( __( "You can’t have more than 6 items in cart", "woocommerce" ), "error" );
    }
    return $passed;
}

// Checking and validating when updating cart item quantities when products are added to cart
add_filter( 'woocommerce_update_cart_validation', 'only_six_items_allowed_cart_update', 10, 4 );
function only_six_items_allowed_cart_update( $passed, $cart_item_key, $values, $updated_quantity ) {

    $cart_items_count = WC()->cart->get_cart_contents_count();
    $original_quantity = $values['quantity'];
    $total_count = $cart_items_count - $original_quantity + $updated_quantity;

    if( $cart_items_count > 6 || $total_count > 6 ){
        // Set to false
        $passed = false;
        // Display a message
         wc_add_notice( __( "You can’t have more than 6 items in cart", "woocommerce" ), "error" );
    }
    return $passed;
}

/**
 * When an item is added to the cart, check total cart quantity
 */
function so_21363268_limit_cart_quantity( $valid, $product_id, $quantity ) {

    $max_allowed = 6;
    $current_cart_count = WC()->cart->get_cart_contents_count();

    if( ( $current_cart_count > $max_allowed || $current_cart_count + $quantity > $max_allowed ) && $valid ){
        wc_add_notice( sprint( __( 'Whoa hold up. You can only have %d items in your cart', 'your-plugin-textdomain' ), $max ), 'error' );
        $valid = false;
    }

    return $valid;

}
add_filter( 'woocommerce_add_to_cart_validation', 'so_21363268_limit_cart_quantity', 10, 3 );