FooGallery Album - Get Previous & Next Gallery ID

album-custom.php

	echo 'Previous : ' . foogallery_album_find_previous_gallery_id( $current_foogallery_album, $foogallery->ID );
	echo 'Next : ' . foogallery_album_find_next_gallery_id( $current_foogallery_album, $foogallery->ID );

functions.php

function foogallery_album_find_next_gallery_id( $album, $gallery_id ) {
	$return = false;
	foreach ( $album->galleries() as $gallery ) {
		if ( $return ) {
			return $gallery->ID;
		}

		if ( $gallery->ID === $gallery_id ) {
			$return = true;
		}
	}
	return null;
}

function foogallery_album_find_previous_gallery_id( $album, $gallery_id ) {
	$previous_id = false;
	foreach ( $album->galleries() as $gallery ) {
		if ( $gallery->ID === $gallery_id ) {
			return $previous_id;
		}

		$previous_id = $gallery->ID;
	}
	return $previous_id;
}