'interval' => WEEK_IN_SECONDS,
			'display'  => __( 'Once Weekly' ),
		),
	);

	/**
	 * Filters the non-default cron schedules.
	 *
	 * @since 2.1.0
	 *
	 * @param array $new_schedules {
	 *     An array of non-default cron schedules keyed by the schedule name. Default empty array.
	 *
	 *     @type array ...$0 {
	 *         Cron schedule information.
	 *
	 *         @type int    $interval The schedule interval in seconds.
	 *         @type string $display  The schedule display name.
	 *     }
	 * }
	 */
	return array_merge( apply_filters( 'cron_schedules', array() ), $schedules );
}

/**
 * Retrieves the name of the recurrence schedule for an event.
 *
 * @see wp_get_schedules() for available schedules.
 *
 * @since 2.1.0
 * @since 5.1.0 {@see 'get_schedule'} filter added.
 *
 * @param string $hook Action hook to identify the event.
 * @param array  $args Optional. Arguments passed to the event's callback function.
 *                     Default empty array.
 * @return string|false Schedule name on success, false if no schedule.
 */
function wp_get_schedule( $hook, $args = array() ) {
	$schedule = false;
	$event    = wp_get_scheduled_event( $hook, $args );

	if ( $event ) {
		$schedule = $event->schedule;
	}

	/**
	 * Filters the schedule name for a hook.
	 *
	 * @since 5.1.0
	 *
	 * @param string|false $schedule Schedule for the hook. False if not found.
	 * @param string       $hook     Action hook to execute when cron is run.
	 * @param array        $args     Arguments to pass to the hook's callback function.
	 */
	return apply_filters( 'get_schedule', $schedule, $hook, $args );
}

/**
 * Retrieves cron jobs ready to be run.
 *
 * Returns the results of _get_cron_array() limited to events ready to be run,
 * ie, with a timestamp in the past.
 *
 * @since 5.1.0
 *
 * @return array[] Array of cron job arrays ready to be run.
 */
function wp_get_ready_cron_jobs() {
	/**
	 * Filter to preflight or hijack retrieving ready cron jobs.
	 *
	 * Returning an array will short-circuit the normal retrieval of ready
	 * cron jobs, causing the function to return the filtered value instead.
	 *
	 * @since 5.1.0
	 *
	 * @param null|array[] $pre Array of ready cron tasks to return instead. Default null
	 *                          to continue using results from _get_cron_array().
	 */
	$pre = apply_filters( 'pre_get_ready_cron_jobs', null );

	if ( null !== $pre ) {
		return $pre;
	}

	$crons    = _get_cron_array();
	$gmt_time = microtime( true );
	$results  = array();

	foreach ( $crons as $timestamp => $cronhooks ) {
		if ( $timestamp > $gmt_time ) {
			break;
		}

		$results[ $timestamp ] = $cronhooks;
	}

	return $results;
}

//
// Private functions.
//

/**
 * Retrieves cron info array option.
 *
 * @since 2.1.0
 * @since 6.1.0 Return type modified to consistently return an array.
 * @access private
 *
 * @return array[] Array of cron events.
 */
function _get_cron_array() {
	$cron = get_option( 'cron' );
	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 );

	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 );
	return $new_cron;
}
 when open_basedir is set, and there's
		 * a bug #17490 with redirected POST requests, so handle redirections outside Curl.
		 */
		curl_setopt( $handle, CURLOPT_FOLLOWLOCATION, false );
		curl_setopt( $handle, CURLOPT_PROTOCOLS, CURLPROTO_HTTP | CURLPROTO_HTTPS );

		switch ( $parsed_args['method'] ) {
			case 'HEAD':
				curl_setopt( $handle, CURLOPT_NOBODY, true );
				break;
			case 'POST':
				curl_setopt( $handle, CURLOPT_POST, true );
				curl_setopt( $handle, CURLOPT_POSTFIELDS, $parsed_args['body'] );
				break;
			case 'PUT':
				curl_setopt( $handle, CURLOPT_CUSTOMREQUEST, 'PUT' );
				curl_setopt( $handle, CURLOPT_POSTFIELDS, $parsed_args['body'] );
				break;
			default:
				curl_setopt( $handle, CURLOPT_CUSTOMREQUEST, $parsed_args['method'] );
				if ( ! is_null( $parsed_args['body'] ) ) {
					curl_setopt( $handle, CURLOPT_POSTFIELDS, $parsed_args['body'] );
				}
				break;
		}

		if ( true === $parsed_args['blocking'] ) {
			curl_setopt( $handle, CURLOPT_HEADERFUNCTION, array( $this, 'stream_headers' ) );
			curl_setopt( $handle, CURLOPT_WRITEFUNCTION, array( $this, 'stream_body' ) );
		}

		curl_setopt( $handle, CURLOPT_HEADER, false );

		if ( isset( $parsed_args['limit_response_size'] ) ) {
			$this->max_body_length = (int) $parsed_args['limit_response_size'];
		} else {
			$this->max_body_length = false;
		}

		// If streaming to a file open a file handle, and setup our curl streaming handler.
		if ( $parsed_args['stream'] ) {
			if ( ! WP_DEBUG ) {
				$this->stream_handle = @fopen( $parsed_args['filename'], 'w+' );
			} else {
				$this->stream_handle = fopen( $parsed_args['filename'], 'w+' );
			}
			if ( ! $this->stream_handle ) {
				return new WP_Error(
					'http_request_failed',
					sprintf(
						/* translators: 1: fopen(), 2: File name. */
						__( 'Could not open handle for %1$s to %2$s.' ),
						'fopen()',
						$parsed_args['filename']
					)
				);
			}
		} else {
			$this->stream_handle = false;
		}

		if ( ! empty( $parsed_args['headers'] ) ) {
			// cURL expects full header strings in each element.
			$headers = array();
			foreach ( $parsed_args['headers'] as $name => $value ) {
				$headers[] = "{$name}: $value";
			}
			curl_setopt( $handle, CURLOPT_HTTPHEADER, $headers );
		}

		if ( '1.0' === $parsed_args['httpversion'] ) {
			curl_setopt( $handle, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_0 );
		} else {
			curl_setopt( $handle, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1 );
		}

		/**
		 * Fires before the cURL request is executed.
		 *
		 * Cookies are not currently handled by the HTTP API. This action allows
		 * plugins to handle cookies themselves.
		 *
		 * @since 2.8.0
		 *
		 * @param resource $handle      The cURL handle returned by curl_init() (passed by reference).
		 * @param array    $parsed_args The HTTP request arguments.
		 * @param string   $url         The request URL.
		 */
		do_action_ref_array( 'http_api_curl', array( &$handle, $parsed_args, $url ) );

		// We don't need to return the body, so don't. Just execute request and return.
		if ( ! $parsed_args['blocking'] ) {
			curl_exec( $handle );

			$curl_error = curl_error( $handle );
			if ( $curl_error ) {
				curl_close( $handle );
				return new WP_Error( 'http_request_failed', $curl_error );
			}
			if ( in_array( curl_getinfo( $handle, CURLINFO_HTTP_CODE ), array( 301, 302 ), true ) ) {
				curl_close( $handle );
				return new WP_Error( 'http_request_failed', __( 'Too many redirects.' ) );
			}

			curl_close( $handle );
			return array(
				'headers'  => array(),
				'body'     => '',
				'response' => array(
					'code'    => false,
					'message' => false,
				),
				'cookies'  => array(),
			);
		}

		curl_exec( $handle );

		$processed_headers   = WP_Http::processHeaders( $this->headers, $url );
		$body                = $this->body;
		$bytes_written_total = $this->bytes_written_total;

		$this->headers             = '';
		$this->body                = '';
		$this->bytes_written_total = 0;

		$curl_error = curl_errno( $handle );

		// If an error occurred, or, no response.
		if ( $curl_error || ( 0 === strlen( $body ) && empty( $processed_headers['headers'] ) ) ) {
			if ( CURLE_WRITE_ERROR /* 23 */ === $curl_error ) {
				if ( ! $this->max_body_length || $this->max_body_length !== $bytes_written_total ) {
					if ( $parsed_args['stream'] ) {
						curl_close( $handle );
						fclose( $this->stream_handle );
						return new WP_Error( 'http_request_failed', __( 'Failed to write request to temporary file.' ) );
					} else {
						curl_close( $handle );
						return new WP_Error( 'http_request_failed', curl_error( $handle ) );
					}
				}
			} else {
				$curl_error = curl_error( $handle );
				if ( $curl_error ) {
					curl_close( $handle );
					return new WP_Error( 'http_request_failed', $curl_error );
				}
			}
			if ( in_array( curl_getinfo( $handle, CURLINFO_HTTP_CODE ), array( 301, 302 ), true ) ) {
				curl_close( $handle );
				return new WP_Error( 'http_request_failed', __( 'Too many redirects.' ) );
			}
		}

		curl_close( $handle );

		if ( $parsed_args['stream'] ) {
			fclose( $this->stream_handle );
		}

		$response = array(
			'headers'  => $processed_headers['headers'],
			'body'     => null,
			'response' => $processed_headers['response'],
			'cookies'  => $processed_headers['cookies'],
			'filename' => $parsed_args['filename'],
		);

		// Handle redirects.
		$redirect_response = WP_Http::handle_redirects( $url, $parsed_args, $response );
		if ( false !== $redirect_response ) {
			return $redirect_response;
		}

		if ( true === $parsed_args['decompress']
			&& true === WP_Http_Encoding::should_decode( $processed_headers['headers'] )
		) {
			$body = WP_Http_Encoding::decompress( $body );
		}

		$response['body'] = $body;

		return $response;
	}

	/**
	 * Grabs the headers of the cURL request.
	 *
	 * Each header is sent individually to this callback, and is appended to the `$header` property
	 * for temporary storage.
	 *
	 * @since 3.2.0
	 *
	 * @param resource $handle  cURL handle.
	 * @param string   $headers cURL request headers.
	 * @return int Length of the request headers.
	 */
	private function stream_headers( $handle, $headers ) {
		$this->headers .= $headers;
		return strlen( $headers );
	}

	/**
	 * Grabs the body of the cURL request.
	 *
	 * The contents of the document are passed in chunks, and are appended to the `$body`
	 * property for temporary storage. Returning a length shorter than the length of
	 * `$data` passed in will cause cURL to abort the request with `CURLE_WRITE_ERROR`.
	 *
	 * @since 3.6.0
	 *
	 * @param resource $handle cURL handle.
	 * @param string   $data   cURL request body.
	 * @return int Total bytes of data written.
	 */
	private function stream_body( $handle, $data ) {
		$data_length = strlen( $data );

		if ( $this->max_body_length && ( $this->bytes_written_total + $data_length ) > $this->max_body_length ) {
			$data_length = ( $this->max_body_length - $this->bytes_written_total );
			$data        = substr( $data, 0, $data_length );
		}

		if ( $this->stream_handle ) {
			$bytes_written = fwrite( $this->stream_handle, $data );
		} else {
			$this->body   .= $data;
			$bytes_written = $data_length;
		}

		$this->bytes_written_total += $bytes_written;

		// Upon event of this function returning less than strlen( $data ) curl will error with CURLE_WRITE_ERROR.
		return $bytes_written;
	}

	/**
	 * Determines whether this class can be used for retrieving a URL.
	 *
	 * @since 2.7.0
	 *
	 * @param array $args Optional. Array of request arguments. Default empty array.
	 * @return bool False means this class can not be used, true means it can.
	 */
	public static function test( $args = array() ) {
		if ( ! function_exists( 'curl_init' ) || ! function_exists( 'curl_exec' ) ) {
			return false;
		}

		$is_ssl = isset( $args['ssl'] ) && $args['ssl'];

		if ( $is_ssl ) {
			$curl_version = curl_version();
			// Check whether this cURL version support SSL requests.
			if ( ! ( CURL_VERSION_SSL & $curl_version['features'] ) ) {
				return false;
			}
		}

		/**
		 * Filters whether cURL can be used as a transport for retrieving a URL.
		 *
		 * @since 2.7.0
		 *
		 * @param bool  $use_class Whether the class can be used. Default true.
		 * @param array $args      An array of request arguments.
		 */
		return apply_filters( 'use_curl_transport', true, $args );
	}
}