我想做的是对购物车中的产品进行分类。然后通过一些条件检查类别id是什么，并显示不同的通知。

到目前为止我有这个

/**
* Cart collaterals hook.
*
* @hooked woocommerce_cross_sell_display
* @hooked woocommerce_cart_totals - 10
*/
$categories = array( 39 );

foreach ( WC()->cart->get_cart() as $cart_item ) {
    if ( has_term( $categories, \'product_cat\', $cart_item[\'product_id\'] ) ) {
        $found = true; // Set to true
        break; // Stop the loop
    }
}        

if( $found ) {
    echo \'Category with ID = 39\';
}
else if ($found != $cart_item[\'category_ids\']) {
    echo "Category with ID = 39 and other ID(\'s)";
}
else {
    "Category with ID != 39";
}

似乎是$cart_item[\'category_ids\'] 不返回类别。$found 正在工作并显示ID=39的类别。

当我var_dump($cart_items) 我确实看到了这样的不同类别：

["category_ids"]=>
  array(1) {
    [0]=>
    int(39)
  }
   /// another stuff in the array

["category_ids"]=>
    array(2) {
      [0]=>
      int(32)
      [1]=>
      int(33)
    }

所以，在购物车中，我有来自id为的类别的产品39, 32 和33.

我也试过了WC()->cart->get_cart()->category_ids 但是这个回报NULL

更新：此

$cat_ids = array();
foreach ( wc()->cart->get_cart() as $cart_item_key => $cart_item ) {
    $cat_ids = array_merge(
        $cat_ids, $cart_item[\'data\']->get_category_ids()
    );
}

$cat_id = 39;
if ( in_array( $cat_id, $cat_ids ) ) {
    echo \'Only 39 \';
} elseif ( ! empty( $cat_ids ) ) {
    echo \'39 + other\';
} else {
    echo \' all other without 39\';
}

当前匹配

时间：类别39+其他->Only 39

时间：所有其他无39->39 + other

时间：仅39->Only 39

应该是这样的

时间：类别39+其他->39 + other

时间：所有其他无39->all other without 39

时间：仅39->Only 39

UPDATE

时间：类别39+其他类别的产品（类别ID=32、33等）

var_dump(count( $cat_ids )); -> int(1)
var_dump($has_cat); -> bool(true)
var_dump(cat_ids); -> array(1) { [0]=> int(39) } <---- there are 3 products in the cart 2 of them are from other categories.

时间：仅39类

var_dump(count( $cat_ids )); -> int(1)
var_dump($has_cat); -> bool(true)
var_dump(cat_ids); -> array(1) { [0]=> int(39) }

时间：无类别39

var_dump(count( $cat_ids )); -> int(2)
var_dump($has_cat); -> bool(false)
var_dump(cat_ids); -> array(2) { [0]=> int(32) [1]=> int(33) } <--- product is added in 2 categories

UPDATE 2

条件1

1) cat 30; 
2) cat 39; 
$cond = 2 (because there are products in cart from 39 + other category)

条件2

1) cat 39; 
$cond = 1 (because in cart is/are product/s only from cat 39)

条件3

1) cat 40; 
2) cat 15;
$cond = last one (because there is no product/s from cat 39 in cart)

$category_ids = $cart_item[\'data\']->get_category_ids(); // array

var_dump( $cart_item[\'category_ids\'] ); // null and PHP throws a notice

$cat_ids = array( 39 );
foreach ( wc()->cart->get_cart() as $cart_item_key => $cart_item ) {
    if ( has_term( $cat_ids, \'product_cat\', $cart_item[\'data\'] ) ) {
        echo \'Has category 39<br>\';
    } else {
        echo \'No category 39<br>\';
    }
}

// Collect the category IDs.
$cat_ids = array();
foreach ( wc()->cart->get_cart() as $cart_item_key => $cart_item ) {
    $cat_ids = array_merge(
        $cat_ids, $cart_item[\'data\']->get_category_ids()
    );
}

// And here we check the IDs.
$cat_id = 39;
$count = count( $cat_ids );
if ( 1 === $count && in_array( $cat_id, $cat_ids ) ) {
    echo \'Only in category 39\';
} elseif ( $count && in_array( $cat_id, $cat_ids ) ) {
    echo \'In category 39 and other categories\';
} else {
    echo \'No category 39\';
}

if ( $count && in_array( $cat_id, $cat_ids ) ) {
    // Only one category.
    if ( $count < 2 ) {
        echo \'Only in category 39\';
    // Multiple categories.
    } else {
        echo \'In category 39 and other categories\';
    }
} else {
    echo \'No category 39\';
}