woocommerce_update_order_item │ action-hook │ WC 1.0

Usage

add_action( 'woocommerce_update_order_item', 'wp_kama_woocommerce_update_order_item_action', 10, 2 );

/**
 * Function for `woocommerce_update_order_item` action-hook.
 * 
 * @param  $item_id 
 * @param  $args    
 *
 * @return void
 */
function wp_kama_woocommerce_update_order_item_action( $item_id, $args ){

	// action...
}

$item_id

-

$args

-

Where the hook is called

do_action( 'woocommerce_update_order_item', $item_id, $args );

do_action( 'woocommerce_update_order_item', $item->get_id(), $item, $item->get_order_id() );

Where the hook is used in WooCommerce