woocommerce_admin_html_order_preview_item_class │ filter-hook │ WC 1.0

Usage

add_filter( 'woocommerce_admin_html_order_preview_item_class', 'wp_kama_woocommerce_admin_html_order_preview_item_class_filter', 10, 3 );

/**
 * Function for `woocommerce_admin_html_order_preview_item_class` filter-hook.
 * 
 * @param  $string 
 * @param  $item   
 * @param  $order  
 *
 * @return 
 */
function wp_kama_woocommerce_admin_html_order_preview_item_class_filter( $string, $item, $order ){

	// filter...
	return $string;
}

$string

-

$item

-

$order

-

Where the hook is called

$row_class      = apply_filters( 'woocommerce_admin_html_order_preview_item_class', '', $item, $order );

Where the hook is used in WooCommerce