我从这个website中找到了这个很棒的片段

以下是检查购物车中是否存在特定产品的功能：

        function woo_in_cart($product_id) {
        global $woocommerce;         
        foreach($woocommerce->cart->get_cart() as $key => $val ) {
            $_product = $val['data'];

            if($product_id == $_product->id ) {
                return true;
            }
        }         
        return false;
        }

这可以在任何需要的地方使用：

      if(woo_in_cart(123)) {
     // Product is already in cart
     }

问题是如何使用它来检查这样的多个产品：

      if(woo_in_cart(123,124,125,126...)) {
     // Product is already in cart
     }

谢谢.

source

解决方法:

global $woocommerce and $woocommerce->cart is outdated and simply replaced by WC()->cart

这是一个自定义函数,其参数接受唯一的整数产品ID或产品ID数组,并返回购物车中匹配的ID数.

代码处理任何产品类型,包括可变产品和产品变体：

function matched_cart_items( $search_products ) {
    $count = 0; // Initializing

    if ( ! WC()->cart->is_empty() ) {
        // Loop though cart items
        foreach(WC()->cart->get_cart() as $cart_item ) {
            // Handling also variable products and their products variations
            $cart_item_ids = array($cart_item['product_id'], $cart_item['variation_id']);

            // Handle a simple product Id (int or string) or an array of product Ids 
            if( ( is_array($search_products) && array_intersect($search_products, cart_item_ids) ) 
            || ( !is_array($search_products) && in_array($search_products, $cart_item_ids)
                $count++; // incrementing items count
        }
    }
    return $count; // returning matched items count 
}

此代码位于活动子主题(活动主题或任何插件文件)的function.php文件中.

代码经过测试和运行.

用法：

1)对于唯一的产品ID(整数)：

$product_id = 102;

// Usage as a condition in an if statement
if( 0 < matched_cart_items($product_id) ){
    echo '<p>There is "'. matched_cart_items($product_id) .'"matched items in cart</p><br>';
} else {
    echo '<p>NO matched items in cart</p><br>';
}

2)对于一系列产品ID：

$product_ids = array(102,107,118);

// Usage as a condition in an if statement
if( 0 < matched_cart_items($product_ids) ){
    echo '<p>There is "'. matched_cart_items($product_ids) .'"matched items in cart</p><br>';
} else {
    echo '<p>NO matched items in cart</p><br>';
}

3)对于3个或更多匹配购物车商品的产品ID数组,例如：

$product_ids = array(102, 107, 118, 124, 137);

// Usage as a condition in an if statement (for 3 matched items or more)
if( 3 <= matched_cart_items($product_ids) ){
    echo '<p>There is "'. matched_cart_items($product_ids) .'"matched items in cart</p><br>';
} else {
    echo '<p>NO matched items in cart</p><br>';
}