# Add Gallery Images From a Custom Field to the Yoast Sitemap

> Includes images stored in a custom field (a list of attachment IDs, such as a gallery) in the image entries of the Yoast SEO sitemap.

- Type: PHP
- Runs: Frontend only
- Category: [Plugin Integrations](https://wpide.com/library/category/integrations/)
- Tags: yoast, sitemap, images
- Author: WPIDE Team
- Installs: 0
- Updated: 2026-10-28
- Page: https://wpide.com/library/yoast-sitemap-field-images/

## Code

```php
// Meta key holding attachment IDs.
$wpide_gallery_field = 'gallery';

add_filter( 'wpseo_sitemap_urlimages', function ( $images, $post_id ) use ( $wpide_gallery_field ) {
    $ids = get_post_meta( $post_id, $wpide_gallery_field, true );
    $ids = is_array( $ids ) ? $ids : explode( ',', (string) $ids );

    foreach ( array_filter( array_map( 'absint', $ids ) ) as $id ) {
        $src = wp_get_attachment_image_url( $id, 'full' );

        if ( $src ) {
            $images[] = array( 'src' => $src );
        }
    }

    return $images;
}, 10, 2 );
```

## Notes

The field may hold an array of IDs or a comma-separated list, as ACF and most gallery fields do.

## How to use it

Install the free WPIDE plugin (https://wordpress.org/plugins/wpide/), find "Add Gallery Images From a Custom Field to the Yoast Sitemap" in its snippet library and add it in one click; or create a new PHP snippet in WPIDE (or any code snippets plugin) and paste the code above. More snippets: https://wpide.com/library/