Code-Snippets-Functions/Execute a function on a child site/Relevanssi/envira-gallery-include-in-search.txt

add_filter( 'relevanssi_content_to_index', 'rlv_envira_gallery_content', 10, 2 );
/**
 * Indexes the attachment content as part of the Envira Gallery posts.
 *
 * @param string  $content The post content.
 * @param WP_Post $post    The post object.
 *
 * @return string The updated content.
 */
function rlv_envira_gallery_content( string $content, WP_Post $post ) : string {
	if ( 'envira' !== $post->post_type ) {
		return $content; // Not a gallery post, skip.
	}
	$args     = array(
		'post_parent'    => $post->ID,
		'posts_per_page' => -1,
	);
	$children = get_children( $args ); // Fetches all the attached images.
	foreach ( $children as $child ) {
		$content .= ' ' . $child->post_title; // Adds the image title.
		$content .= ' ' . $child->post_excerpt; // Adds the image caption.

        $tags = get_the_terms( $child->ID, 'envira-tag' );
		if ( ! is_array( $tags ) ) {
			$tags = array();
		}
		foreach ( $tags as $tag ) {
			$content .= ' ' . $tag->name; // Adds the tag name.
		}
      
		$cats = get_the_terms( $child->ID, 'envira-category' );
		if ( ! is_array( $cats ) ) {
			$cats = array();
		}
		foreach ( $cats as $cat ) {
			$content .= ' ' . $cat->name; // Adds the category name.
		}
	}
	return $content;
}