Prevent the price of a product from being overridden during a Product Set update. [datafeedr][dfrpswc]

prevent_product_price_override.php

<?php

/**
 * Prevent the price of a product from being overridden during a Product Set update.
 *
 * This code will allow the product's price to be imported when the product is first imported but
 * upon all subsequent Product Set updates, the product's price will not be updated. Instead it will
 * rely on the price already in the database.
 *
 * @param array $meta An array containing postmeta data for this $post.
 * @param array $post An array of post data including ID, post_title, post_status, etc...
 * @param array $product An array of product data returned from the Datafeedr API.
 * @param array $set A post array for this Product Set with an array key of postmeta containing all post meta data.
 * @param string $action The action the Product Set is performing. Value are either "insert" or "update".
 *
 * @return array Updated $meta array.
 */
add_filter( 'dfrpswc_filter_postmeta_array', 'mycode_prevent_product_price_override', 20, 5 );
function mycode_prevent_product_price_override( $meta, $post, $product, $set, $action ) {

	// Do nothing if we are inserting the product for the first time.
	if ( 'insert' == $action ) {
		return $meta;
	}

	// Since we are updating the product, ignore all pricing information.
	unset( $meta['_price'] );
	unset( $meta['_regular_price'] );
	unset( $meta['_sale_price'] );

	return $meta;
}