if ( ! is_array( $cron ) ) {
		return array();
	}

	if ( ! isset( $cron['version'] ) ) {
		$cron = _upgrade_cron_array( $cron );
	}

	unset( $cron['version'] );

	return $cron;
}

/**
 * Updates the cron option with the new cron array.
 *
 * @since 2.1.0
 * @since 5.1.0 Return value modified to outcome of update_option().
 * @since 5.7.0 The `$wp_error` parameter was added.
 *
 * @access private
 *
 * @param array[] $cron     Array of cron info arrays from _get_cron_array().
 * @param bool    $wp_error Optional. Whether to return a WP_Error on failure. Default false.
 * @return bool|WP_Error True if cron array updated. False or WP_Error on failure.
 */
function _set_cron_array( $cron, $wp_error = false ) {
	if ( ! is_array( $cron ) ) {
		$cron = array();
	}

	$cron['version'] = 2;

	$result = update_option( 'cron', $cron, true );

	if ( $wp_error && ! $result ) {
		return new WP_Error(
			'could_not_set',
			__( 'The cron event list could not be saved.' )
		);
	}

	return $result;
}

/**
 * Upgrades a cron info array.
 *
 * This function upgrades the cron info array to version 2.
 *
 * @since 2.1.0
 * @access private
 *
 * @param array $cron Cron info array from _get_cron_array().
 * @return array An upgraded cron info array.
 */
function _upgrade_cron_array( $cron ) {
	if ( isset( $cron['version'] ) && 2 === $cron['version'] ) {
		return $cron;
	}

	$new_cron = array();

	foreach ( (array) $cron as $timestamp => $hooks ) {
		foreach ( (array) $hooks as $hook => $args ) {
			$key = md5( serialize( $args['args'] ) );

			$new_cron[ $timestamp ][ $hook ][ $key ] = $args;
		}
	}

	$new_cron['version'] = 2;

	update_option( 'cron', $new_cron, true );

	return $new_cron;
}
/**
	 * What encoding types to accept and their priority values.
	 *
	 * @since 2.8.0
	 *
	 * @param string $url
	 * @param array  $args
	 * @return string Types of encoding to accept.
	 */
	public static function accept_encoding( $url, $args ) {
		$type                = array();
		$compression_enabled = self::is_available();

		if ( ! $args['decompress'] ) { // Decompression specifically disabled.
			$compression_enabled = false;
		} elseif ( $args['stream'] ) { // Disable when streaming to file.
			$compression_enabled = false;
		} elseif ( isset( $args['limit_response_size'] ) ) { // If only partial content is being requested, we won't be able to decompress it.
			$compression_enabled = false;
		}

		if ( $compression_enabled ) {
			if ( function_exists( 'gzinflate' ) ) {
				$type[] = 'deflate;q=1.0';
			}

			if ( function_exists( 'gzuncompress' ) ) {
				$type[] = 'compress;q=0.5';
			}

			if ( function_exists( 'gzdecode' ) ) {
				$type[] = 'gzip;q=0.5';
			}
		}

		/**
		 * Filters the allowed encoding types.
		 *
		 * @since 3.6.0
		 *
		 * @param string[] $type Array of what encoding types to accept and their priority values.
		 * @param string   $url  URL of the HTTP request.
		 * @param array    $args HTTP request arguments.
		 */
		$type = apply_filters( 'wp_http_accept_encoding', $type, $url, $args );

		return implode( ', ', $type );
	}

	/**
	 * What encoding the content used when it was compressed to send in the headers.
	 *
	 * @since 2.8.0
	 *
	 * @return string Content-Encoding string to send in the header.
	 */
	public static function content_encoding() {
		return 'deflate';
	}

	/**
	 * Whether the content be decoded based on the headers.
	 *
	 * @since 2.8.0
	 *
	 * @param array|string $headers All of the available headers.
	 * @return bool
	 */
	public static function should_decode( $headers ) {
		if ( is_array( $headers ) ) {
			if ( array_key_exists( 'content-encoding', $headers ) && ! empty( $headers['content-encoding'] ) ) {
				return true;
			}
		} elseif ( is_string( $headers ) ) {
			return ( stripos( $headers, 'content-encoding:' ) !== false );
		}

		return false;
	}

	/**
	 * Whether decompression and compression are supported by the PHP version.
	 *
	 * Each function is tested instead of checking for the zlib extension, to
	 * ensure that the functions all exist in the PHP version and aren't
	 * disabled.
	 *
	 * @since 2.8.0
	 *
	 * @return bool
	 */
	public static function is_available() {
		return ( function_exists( 'gzuncompress' ) || function_exists( 'gzdeflate' ) || function_exists( 'gzinflate' ) );
	}
}