WP_Background_Process::get_batch()

		protected function get_batch() {
			global $wpdb;

			$table        = $wpdb->options;
			$column       = 'option_name';
			$key_column   = 'option_id';
			$value_column = 'option_value';

			if ( is_multisite() ) {
				$table        = $wpdb->sitemeta;
				$column       = 'meta_key';
				$key_column   = 'meta_id';
				$value_column = 'meta_value';
			}

			$key = $this->identifier . '_batch_%';

			$query = $wpdb->get_row( $wpdb->prepare( "
			SELECT *
			FROM {$table}
			WHERE {$column} LIKE %s
			ORDER BY {$key_column} ASC
			LIMIT 1
		", $key ) );

			$batch       = new stdClass();
			$batch->key  = $query->$column;
			$batch->data = maybe_unserialize( $query->$value_column );

			return $batch;
		}