Add SKU to items in order email - woocommerce

woocommerce-add-sku-on-order.php

function artomultiplo_add_sku_woocommerce_emails( $output, $order ) {
	
	// set a flag so we don't recursively call this filter
	static $run = 0;
  
	// if we've already run this filter, bail out
	if ( $run ) {
		return $output;
	}
  
	$args = array(
		'show_sku'      => true,
	);
  
	// increment our flag so we don't run again
	$run++;
  
	// if first run, give WooComm our updated table
	return $order->email_order_items_table( $args );
}
add_filter( 'woocommerce_email_order_items_table', 'artomultiplo_add_images_woocommerce_emails', 10, 2 );