Imports additional product images for an array of given fields as gallery images for a WooCommerce product. [datafeedr][dfrps][dfrpswc]

import-woocommerce-gallery-images.php

<?php

/**
 * Imports additional product images for an array of given fields as gallery images
 * for a WooCommerce product.
 *
 * @param WP_Post $post
 */
function mycode_import_woocommerce_gallery_images( $post ) {

	/**
	 * Modify this array and add the product fields that have alternate images
	 * that you want to be imported into a product's gallery.
	 */
	$image_fields = array(
		'alternateimage',
		'alternateimagetwo',
		'alternateimagethree',
		'alternateimagefour',
	);

	// Stop editing here.

	if ( 'publish' != $post->post_status ) {
		return;
	}

	$product = dfrps_product( $post->ID );

	if ( empty( $product ) ) {
		return;
	}

	$urls = [];
	foreach ( $image_fields as $image_field ) {

		if ( ! isset( $product[ $image_field ] ) ) {
			continue;
		}

		if ( ! dfrapi_string_starts_with( $product[ $image_field ], [ 'http', '//' ] ) ) {
			continue;
		}

		$urls[ $image_field ] = $product[ $image_field ];
	}

	if ( empty( $urls ) ) {
		return;
	}

	$args = array(
		'title'             => $post->post_title,
		'file_name'         => $post->post_title,
		'post_id'           => $post->ID,
		'description'       => $post->post_content,
		'caption'           => $post->post_title,
		'alt_text'          => $post->post_title,
		'user_id'           => $post->post_author,
		'is_post_thumbnail' => false,
		'timeout'           => 20,
	);

	$gallery_meta_key = '_product_image_gallery';

	$gallery_ids        = get_post_meta( $post->ID, $gallery_meta_key, true );
	$gallery_ids        = array_filter( explode( ',', $gallery_ids ) );
	$update_gallery_ids = false;

	foreach ( $urls as $field => $url ) {

		$image_check_meta_key = '_mycode_product_image_gallery_' . $field;

		if ( dfrps_image_import_attempted( $post->ID, $image_check_meta_key ) ) {
			continue;
		}

		$result = datafeedr_import_image( $url, $args );

		update_post_meta( $post->ID, $image_check_meta_key, 0 );

		if ( is_wp_error( $result ) || $result->has_error() ) {
			continue;
		}

		$gallery_ids[] = $result->attachment_id();

		$update_gallery_ids = true;
	}

	if ( $update_gallery_ids ) {
		update_post_meta( $post->ID, $gallery_meta_key, implode( ',', $gallery_ids ) );
	}
}

add_action( 'the_post', 'mycode_import_woocommerce_gallery_images' );