woocommerce_ajax_add_order_item_validation │ filter-hook │ WC 1.0

Usage

add_filter( 'woocommerce_ajax_add_order_item_validation', 'wp_kama_woocommerce_ajax_add_order_item_validation_filter', 10, 4 );

/**
 * Function for `woocommerce_ajax_add_order_item_validation` filter-hook.
 * 
 * @param  $validation_error 
 * @param  $product          
 * @param  $order            
 * @param  $qty              
 *
 * @return 
 */
function wp_kama_woocommerce_ajax_add_order_item_validation_filter( $validation_error, $product, $order, $qty ){

	// filter...
	return $validation_error;
}

$validation_error

-

$product

-

$order

-

$qty

-

Where the hook is called

$validation_error = apply_filters( 'woocommerce_ajax_add_order_item_validation', $validation_error, $product, $order, $qty );

Where the hook is used in WooCommerce