BP_Media::get_album_media_ids( bool $album_id = false )

	public static function get_album_media_ids( $album_id = false ) {

		if ( ! $album_id ) {
			return false;
		}

		global $wpdb;

		$bp = buddypress();

		// Select conditions.
		$select_sql = "SELECT DISTINCT m.id FROM {$bp->media->table_name} m WHERE m.album_id = {$album_id}";

		$cache_group = 'bp_media_album_media_ids';

		$cached = bp_core_get_incremented_cache( $select_sql, $cache_group );
		if ( false === $cached ) {
			$media_ids = $wpdb->get_col( $select_sql );
			bp_core_set_incremented_cache( $select_sql, $cache_group, $media_ids );
		} else {
			$media_ids = $cached;
		}

		return $media_ids;
	}