如何提取WooCommerce订单项非唯一元键的指定元数据

I see you're working with WooCommerce 3 order items and need to group their meta data by shared keys like Carboidrato, Proteína, and Guarnição. Let's adjust your existing code to achieve this cleanly, while avoiding direct access to protected properties (best practice for WooCommerce development).

Modified Code with Grouping Logic #

// Get the $order object from an ID (if needed)
$order = wc_get_order( $order_id );

// Initialize an empty array to store grouped meta data
$grouped_meta = [];

// Loop through each order line item
foreach( $order->get_items() as $item ){
    // Fetch all item meta data (including hidden entries)
    $item_meta = $item->get_meta_data();
    
    // Loop through each meta entry to organize by key
    foreach( $item_meta as $meta ){
        // Get key and value using WC_Meta_Data's public methods
        $meta_key = $meta->get_key();
        $meta_value = $meta->get_value();
        
        // Create or append to the group for this key
        if( !isset( $grouped_meta[ $meta_key ] ) ){
            $grouped_meta[ $meta_key ] = [];
        }
        $grouped_meta[ $meta_key ][] = $meta_value;
    }
}

// Display the grouped output (for testing)
echo '<pre>';
print_r( $grouped_meta );
echo '</pre>';

How This Works #

1. Initialization: We start with an empty $grouped_meta array to hold our organized data.
2. Fetch Meta Data: Using get_meta_data() gives us WC_Meta_Data objects, and we use their public methods (get_key() and get_value()) to safely access the data without touching protected properties.
3. Grouping: For each meta entry, we check if the key already exists in our grouped array. If not, we create a new array for it; then we append the value to that group.

Example Output #

Your grouped data will look like this, making it easy to access all values for each category:

Array
(
    [Carboidrato] => Array
        (
            [0] => Arroz Branco COM Feijão
            [1] => Arroz Integral à Grega COM Feijão
            [2] => Macarrão Alho Poró
        )

    [Proteína] => Array
        (
            [0] => Parmegiana Bovina
            [1] => Parmegiana Frango
        )

    [Guarnição] => Array
        (
            [0] => Batata Rosthi Recheada com Requeijão
            [1] => Farofa
        )
)

Alternative: Using Formatted Meta Data #

If you prefer to work with the get_formatted_meta_data() output (stdClass objects), you can adjust the inner loop like this:

foreach( $item->get_formatted_meta_data( '_', true ) as $meta ){
    $meta_key = $meta->key;
    $meta_value = $meta->value;
    
    if( !isset( $grouped_meta[ $meta_key ] ) ){
        $grouped_meta[ $meta_key ] = [];
    }
    $grouped_meta[ $meta_key ][] = $meta_value;
}

内容的提问来源于stack exchange，提问作者vrec