/**
 * Return a clean, ordered list of valid image attachment IDs.
 *
 * @param string $raw_gallery Comma-separated attachment IDs.
 * @return array
 */
function newsroom_validate_event_gallery( $raw_gallery ) {

    if (
        ! is_string( $raw_gallery ) ||
        '' === trim( $raw_gallery )
    ) {
        return array();
    }

    $submitted_ids = explode( ',', $raw_gallery );
    $valid_ids     = array();

    foreach ( $submitted_ids as $raw_id ) {

        $attachment_id = absint( trim( $raw_id ) );

        if ( ! $attachment_id ) {
            continue;
        }

        $attachment = get_post( $attachment_id );

        if (
            ! $attachment ||
            'attachment' !== $attachment->post_type ||
            'trash' === $attachment->post_status
        ) {
            continue;
        }

        if ( ! wp_attachment_is_image( $attachment_id ) ) {
            continue;
        }

        if ( in_array( $attachment_id, $valid_ids, true ) ) {
            continue;
        }

        $valid_ids[] = $attachment_id;
    }

    return $valid_ids;
}

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<?xml-stylesheet type="text/xsl" href="https://www.capturaveritasmedia.com/wp-sitemap-index.xsl" ?>
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