Woocommerce get sub order number in multi vendor orders

Question

I'm using woocommerce and dokan plugin in wordpress. After I try to order product in multi vendor, I get the sub order number in thank you page. I try to get sub order number by running this code below but not work.

//example order id
$order = wc_get_order(1234);

$order_id = $order->get_id();

$sub_orders = get_children( 
   array(    
     'post_parent' => $order_id,    
     'post_type'   => 'shop_order',    
     'post_status' => array( 
        'wc-pending', 
        'wc-completed', 
        'wc-processing', 
        'wc-on-hold' 
       )
   ) 
);

when i try var_dump($sub_order) i got 0 array result. is any way to get sub order?

Answer 1

Try this:

$parent_order = wc_get_order(1234);

$sub_orders = get_children([
    'post_parent' => dokan_get_prop( $parent_order, 'id' ),
    'post_type'   => 'shop_order',
]);

Note that if the parent order contains products only from one vendor your $sub_orders variable will be empty.

Answer 2

I found this function in plugin:

/**
 * 
 * @global object $wpdb
 * @param type $parent_order_id
 * @return type
 */
function dokan_get_suborder_ids_by ($parent_order_id){
    
    global $wpdb;
     
     $sql = "SELECT ID FROM " . $wpdb->prefix . "posts
             WHERE post_type = 'shop_order'
             AND post_parent = " . $parent_order_id;
     
     $sub_orders = $wpdb->get_results($sql);

    if ( ! $sub_orders ) {
        return null;
    }
    
    return $sub_orders;

I think you can use her for getting sub orders, for example:

$order = wc_get_order(1234);

$order_id = $order->get_id();

$sub_orders = dokan_get_suborder_ids_by($order_id);

foreach($sub_orders as $sub_order) {
    $child_order = wc_get_order($sub_order);
    var_dump($child_order);
}

Hope help you