问题:

I am using this to create a new function in my functions.php file

add_action( 'woocommerce_new_order', 'create_invoice_for_wc_order',  1, 1  );
function create_invoice_for_wc_order() {

}

it is to execute some custom code when a new order is placed, how can i get the order information (ordered products etc) inside my function

回答1:

You can use $order_id as a parameter for your woocommerce_new_order callback and get the order details from the $order_id.

Example:

// define the woocommerce_new_order callback 
function create_invoice_for_wc_order( $order_id ) { 
    // get order details data...
    $order = new WC_Order( $order_id );
    var_dump($order);
};

References:

http://hookr.io/actions/woocommerce_new_order/

https://docs.woothemes.com/wc-apidocs/class-WC_Order.html

回答2:

woocommerce_new_order includes an $order_id parameter. You can use it in your callback:

add_action( 'woocommerce_new_order', 'create_invoice_for_wc_order',  1, 1  );
function create_invoice_for_wc_order( $order_id ) {
    $order = new WC_Order( $order_id );
    $items = $order->get_items();
    // etc...
}