Automattic / jetpack

	 * @param int   $previous_interval_end The last item from the previous interval.

	 * @return array Chunk IDs with the previous interval end.

	 */

	protected function get_chunks_with_preceding_end( $chunks, $previous_interval_end ) {

		$chunks_with_ends = array();

		foreach ( $chunks as $chunk ) {

			$chunks_with_ends[] = array(

				'ids'          => $chunk,

				'previous_end' => $previous_interval_end,

			);

			// Chunks are ordered in descending order.

			$previous_interval_end = end( $chunk );

		}

		return $chunks_with_ends;

	}

	/**

	 * Get metadata of a particular object type within the designated meta key whitelist.

	 * @param int   $previous_interval_end The last item from the previous interval.

	 * @return array Chunk IDs with the previous interval end.

	 */

	protected function get_chunks_with_preceding_end( $chunks, $offset ) {

		$chunks_with_ends = array();

		foreach ( $chunks as $chunk ) {

			$chunks_with_ends[] = array(

				'ids'    => $chunk,

				'offset' => $offset += count( $chunk ),

			);

		}

		return $chunks_with_ends;

	}

	/**