woocommerce_get_product_from_item │ filter-hook │ WC 1.0

Usage

add_filter( 'woocommerce_get_product_from_item', 'wp_kama_woocommerce_get_product_from_item_filter', 10, 3 );

/**
 * Function for `woocommerce_get_product_from_item` filter-hook.
 * 
 * @param  $product 
 * @param  $that    
 * @param  $order   
 *
 * @return 
 */
function wp_kama_woocommerce_get_product_from_item_filter( $product, $that, $order ){

	// filter...
	return $product;
}

$product

-

$that

-

$order

-

Where the hook is called

$product = apply_filters( 'woocommerce_get_product_from_item', $product, $this, $this->get_order() );

return apply_filters( 'woocommerce_get_product_from_item', $product, $item, $this );

Where the hook is used in WooCommerce