Php 在特定日期之间使用特定的元密钥销售产品

这个错误.未捕获类型错误:不支持的操作数类型:WC_Product_Simple+WC_Product_Simple. 这是因为您试图使用+=运算符将两个产品对象添加到一起，这在对象的PHP中是不受支持的.

您可以try 将产品收集到一个数组中.

add_action( 'woocommerce_order_status_processing', 'update_product_meta', 20, 2 );
function update_product_meta( $order_id, $order ) {
    foreach ( $order->get_items() as $item ) {
        $product_id = $item->get_product_id(); //  use get_product_id()
        $product = wc_get_product( $product_id );
        if ( $product ) {
            $post_author = get_post_field( 'post_author', $product_id ); // get post author
            $charity_tag = get_the_author_meta( 'charity_tag', $post_author );
            $product->update_meta_data( 'product_charity_tag', $charity_tag );
            $product->save();
        }
    }
}

to retrieve products sold with a specific charity tag with a date range

function get_charity_tagged_products( $first_day_month, $last_day_month, $charity_tag ) {
    $orders = wc_get_orders(array(
        'limit' => -1,
        'date_after' => $first_day_month,
        'date_before' => $last_day_month,
        'status' => 'completed', //if you have complete order status, change as needed
    ));

    $all_products = array(); // Initialize as array

    if ( !empty( $orders ) ) {
        foreach ( $orders as $order ) {
            foreach ( $order->get_items() as $item ) {
                $product = $item->get_product();
                if ( $product && $product->get_meta( 'product_charity_tag' ) == $charity_tag ) {
                    $all_products[] = $product; // Add product to array
                }
            }
        }
    }

    return $all_products; // Return the array of products
}

使用方法EX

$first_day_month = '2023-01-01';
$last_day_month = '2023-01-31';
$charity_tag = 'bhf';
$charity_products = get_charity_tagged_products($first_day_month, $last_day_month, $charity_tag);