woocommerce_order_items_meta_display │ filter-hook │ WC 1.0

Usage

add_filter( 'woocommerce_order_items_meta_display', 'wp_kama_woocommerce_order_items_meta_display_filter', 10, 3 );

/**
 * Function for `woocommerce_order_items_meta_display` filter-hook.
 * 
 * @param  $output 
 * @param  $that   
 * @param  $flat   
 *
 * @return 
 */
function wp_kama_woocommerce_order_items_meta_display_filter( $output, $that, $flat ){

	// filter...
	return $output;
}

$output

-

$that

-

$flat

-

Where the hook is called

$output = apply_filters( 'woocommerce_order_items_meta_display', $output, $this, $flat );

Where the hook is used in WooCommerce