woocommerce_update_product │ action-hook │ WC 1.0

Usage

add_action( 'woocommerce_update_product', 'wp_kama_woocommerce_update_product_action', 10, 2 );

/**
 * Function for `woocommerce_update_product` action-hook.
 * 
 * @param  $product_id 
 * @param  $product    
 *
 * @return void
 */
function wp_kama_woocommerce_update_product_action( $product_id, $product ){

	// action...
}

$product_id

-

$product

-

Where the hook is called

do_action( 'woocommerce_update_product', $product->get_id(), $product );

Where the hook is used in WooCommerce

add_action( 'woocommerce_update_product', array( __CLASS__, 'clear_stock_count_cache' ) );