This code is for using the Comparison Sets plugin on products not imported by the WooCommerce Importer plugin. It will use the SKU value as the EAN value so that Comparison Sets can be generated from EAN values as well as the product name for products added to WooCommerce manually. [datafeedr][dfrcs]

add-sku-as-ean-to-dfrcs.php

<?php

/**
 * Add "sku" value as "ean" to $source.
 *
 * @param array $source
 * @param WC_Product $product
 *
 * @return array Updated $source array.
 */
add_filter( 'dfrcs_wc_source', 'mycode_add_ean_to_source', 20, 2 );
function mycode_add_ean_to_source( $source, $product ) {

	if ( isset( $source['id'] ) ) {
		return $source;
	}

	$ean = $product->get_sku();

	$source['ean'] = $ean;

	return $source;
}