当购物车中添加了带有特殊产品类别“ cat_x”的商品并显示一些不同的自定义通知时,我正在使用以下代码从购物车中删除其他WooCommerce产品类别商品.该代码来自this thread,效果很好：

add_action( 'woocommerce_check_cart_items', 'checking_cart_items' );
function checking_cart_items() {
    $special = false;
    $catx = 'cat_x';
    $number_of_items = sizeof( WC()->cart->get_cart() );

    if ( $number_of_items > 0 ) {

        // Loop through all cart products
        foreach ( WC()->cart->get_cart() as $cart_item_key => $values ) {
            $item = $values['data'];
            $item_id = $item->id;

            // detecting if 'cat_x' item is in cart
            if ( has_term( $catx, 'product_cat', $item_id ) ) {
                if (!$special)
                    $special = true;
            }
        }

        // Re-loop through all cart products
        foreach ( WC()->cart->get_cart() as $cart_item_key => $values ) {
            $item = $values['data'];
            $item_id = $item->id;

            if ( $special ) // there is a 'cat_x' item in cart
            { 
                if ( $number_of_items == 1 ) { // only one 'cat_x' item in cart
                    if ( empty( $notice ) )
                        $notice = '1';
                }
                if ( $number_of_items >= 2 ) { // 'cat_x' item + other categories items in cart
            // removing other categories items from cart
                    if ( !has_term( $catx, 'product_cat', $item_id ) ) {
                        WC()->cart->remove_cart_item( $cart_item_key ); // removing item from cart
                        if ( empty( $notice ) || $notice == '1' )
                            $notice = '2';
                    }
                }
            } else { // Only other categories items
                if ( empty( $notice ) )
                    $notice = '3';
            }
        }

        // Firing notices
        if ( $notice == '1' ) { // message for an 'cat_x' item only (alone)
            wc_add_notice( sprintf( '<p class="woocommerce-error">bla bla bla one category X item in the cart</p>' ), 'success' );
        } elseif ( $notice == '2' ) { // message for an 'cat_x' item and other ones => removed other ones 
            wc_add_notice( sprintf( '<p class="woocommerce-error">bla bla bla ther is already category X in the cart => Other category items has been removed</p>' ), 'error' );
        } elseif ( $notice == '3' ) { // message for other categories items (if needed)
            wc_add_notice( sprintf( '<p class="woocommerce-error">bla bla bla NOT category X in the cart</p>' ), 'success' );
        }
    }
} 

有条件函数has_term()也可以用于类别数组,我尝试代替一个类别在该代码中设置类别数组.但这不起作用.

但是,我的需求发生了变化：我不想让客户有可能从不同类别中选择购物车项目.因此,购物车必须始终具有相同产品类别的商品.

有什么帮助吗？

谢谢.

解决方法:

制作挂接到woocommerce_add_to_cart_validation过滤器挂钩中的自定义函数将以一种更简单的方式完成此工作,而无需设置类别数组.

因此,您的代码将更快,更紧凑.此外,您可以显示自定义通知以警告客户.

如果购物车中有其他类别的商品,则此代码将避免添加到购物车中：

add_filter( 'woocommerce_add_to_cart_validation', 'add_to_cart_validation_callback', 10, 3 );
function add_to_cart_validation_callback( $passed, $product_id, $quantity) {
    // HERE set your alert text message
    $message = __( 'MY ALERT MESSAGE.', 'woocommerce' );

    if( ! WC()->cart->is_empty() ) {
        // Get the product category terms for the current product
        $terms_slugs = wp_get_post_terms( $product_id, 'product_cat' array('fields' => 'slugs'));

        // Loop through cart items
        foreach (WC()->cart->get_cart() as $cart_item ){
            if( ! has_term( $terms_slugs, 'product_cat', $cart_item['product_id'] )) {
                $passed = false;
                wc_add_notice( $message, 'error' );
                break;
            }
        }
    }
    return $passed;
}

代码在您的活动子主题(或主题)的function.php文件中,或者在任何插件文件中.

此代码已经过测试,可以正常工作

Restricting cart items to be only from different product categories:

在函数中替换条件：

if( ! has_term( $product_cats, 'product_cat', $cart_item['product_id'] )) { 

通过

if( has_term( $product_cats, 'product_cat', $cart_item['product_id'] )) {