Automattic / jetpack

		$callable_checksums = (array) \Jetpack_Options::get_raw_option( self::CALLABLES_CHECKSUM_OPTION_NAME, array() );

		$has_changed        = false;

		// Only send the callables that have changed.

		foreach ( $callables as $name => $value ) {

			$checksum = $this->get_check_sum( $value );

			// Explicitly not using Identical comparison as get_option returns a string.

			if ( ! is_null( $value ) && $this->should_send_callable( $callable_checksums, $name, $checksum ) ) {

				/**

				 * Tells the client to sync a callable (aka function) to the server

				 *

				 * @since 4.2.0

				 *

				 * @param string The name of the callable

				 * @param mixed The value of the callable

				 */

				do_action( 'jetpack_sync_callable', $name, $value );

				$callable_checksums[ $name ] = $checksum;

				$has_changed                 = true;

			} else {

				$callable_checksums[ $name ] = $checksum;

			}

		}

		if ( $has_changed ) {

			\Jetpack_Options::update_raw_option( self::CALLABLES_CHECKSUM_OPTION_NAME, $callable_checksums );

		}

		$constants_checksums = (array) get_option( self::CONSTANTS_CHECKSUM_OPTION_NAME, array() );

		foreach ( $constants as $name => $value ) {

			$checksum = $this->get_check_sum( $value );

			// Explicitly not using Identical comparison as get_option returns a string.

			if ( ! $this->still_valid_checksum( $constants_checksums, $name, $checksum ) && ! is_null( $value ) ) {

				/**

				 * Tells the client to sync a constant to the server

				 *

				 * @param string The name of the constant

				 * @param mixed The value of the constant

				 *

				 * @since 4.2.0

				 */

				do_action( 'jetpack_sync_constant', $name, $value );

				$constants_checksums[ $name ] = $checksum;

			} else {

				$constants_checksums[ $name ] = $checksum;

			}

		}

		update_option( self::CONSTANTS_CHECKSUM_OPTION_NAME, $constants_checksums );

	}