# Add Custom Field Images to the Rank Math Sitemap

> Adds images from a gallery custom field (attachment IDs) to each post's image entries in the Rank Math sitemap.

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

## Code

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

add_filter( 'rank_math/sitemap/urlimages', function ( $images, $post_id ) use ( $wpide_rm_gallery_field ) {
    $ids = get_post_meta( $post_id, $wpide_rm_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, 'title' => get_the_title( $id ), 'alt' => (string) get_post_meta( $id, '_wp_attachment_image_alt', true ) );
        }
    }

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

## Notes

The field may be an array of IDs or a comma-separated list.

## How to use it

Install the free WPIDE plugin (https://wordpress.org/plugins/wpide/), find "Add Custom Field Images to the Rank Math 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/