Cron for WordPress Multisite

ms-cron-runner.php

<?php

// Author: Kaspars Dambis <hi@kaspars.net>
// Usage: php ms-cron-runner.php --domain=example.com [--path=/path/to/wordpress]

// We can't run this reliably from CLI because of how WordPress
// relies on $_SERVER for loading functions.php
if ( php_sapi_name() !== 'cli' )
	die;

define( 'WP_USE_THEMES', false );

$_SERVER = array();

$opts = getopt( null, array(
	'domain::',
	'path:',
) );

// WordPress uses the domain name to resolve DB settings, etc.
if ( isset( $opts['domain'] ) )
	$_SERVER['HTTP_HOST'] = $opts['domain'];
else
	die( 'Please specify the --domain option.' . PHP_EOL );

// Resolve WordPress core
if ( isset( $opts['path'] ) )
	$path = $opts['path'] . '/wp-load.php';
else
	$path = dirname( __FILE__ ) . '/wp-load.php';

if ( ! file_exists( $path ) || ! is_file( $path ) )
	die( sprintf( 'Can not find %s.' . PHP_EOL, $path ) );

// Load WordPress core
require_once( $path );

if ( ! defined( 'ABSPATH' ) )
	die( sprintf( 'Can not find WordPress at %s.' . PHP_EOL, $path ) );

$sites = get_sites( array(
        'deleted' => 0,
        'archived' => 0,
) );

foreach ( $sites as $site ) {
        $site_url = get_site_url( $site->blog_id, 'wp-cron.php' );

        $run = wp_remote_get(
                $site_url,
                array(
                        'blocking' => true,
                        'sslverify' => false,
                )
        );

        if ( is_wp_error( $run ) )
                printf( 'Failed WordPress cron for %s.' . PHP_EOL, $site_url );
        else
                printf( 'Completed WordPress cron for %s.' . PHP_EOL, $site_url );
}

ms-cron.php

<?php

// Author: Kaspars Dambis <hi@kaspars.net>

if ( php_sapi_name() == 'cli' )
	die( 'WordPress cron does not support CLI.' . PHP_EOL );

ignore_user_abort(true);

define( 'DOING_CRON', true );
define( 'WP_USE_THEMES', false );

$stats = array();

// Location of WordPress core
$path = realpath( './wp-load.php' );

if ( ! file_exists( $path ) || ! is_file( $path ) )
	die( sprintf( 'Can not find %s.' . PHP_EOL, $path ) );

// Load WordPress core
require_once( $path );

// Ensure that WordPress core was loaded
if ( ! defined( 'ABSPATH' ) )
	die( sprintf( 'Can not find WordPress at %s.' . PHP_EOL, $path ) );

printf( 'Running cron jobs on %s.' . PHP_EOL, site_url() );

// Check if there is a cron job in progress
$lock = get_transient('doing_cron');
if ( $lock ) {
	printf( 'Another cron job is already running for %d seconds on %s.' . PHP_EOL, ( time() - $lock ), site_url() );
	continue;
}

// Get all cron tasks from the 'cron' option
$crons = _get_cron_array();
$time = time();

// Lock this cron job
$lock = sprintf( '%.22F', microtime( true ) );
set_transient( 'doing_cron', $lock );

foreach ( $crons as $timestamp => $hooks ) {

	// Skip tasks in future
	if ( $timestamp > $time )
		continue;

	foreach ( $hooks as $hook => $events ) {

		foreach ( $events as $id => $event ) {

			// This is a reapeating event, register another one in future
			if ( $event['schedule'] ) {
				wp_reschedule_event( $timestamp, $event['schedule'], $hook, $event['args'] );
			}

			// Remove this current job
			wp_unschedule_event( $timestamp, $hook, $event['args'] );

			printf( 'Running "%s" cron job on %s.' . PHP_EOL, $hook, site_url() );

			// Run the cron hook
			do_action_ref_array( $hook, $event['args'] );

			$stats[] = $hook;

			// Ensure that cron lock is still the same
			if ( get_transient('doing_cron') !== $lock ) {
				printf( 'Another process stole the cron lock on %s.' . PHP_EOL, site_url() );
				die;
			}
		}
	}
}

// Remove the lock
delete_transient( 'doing_cron' );

print_r($stats);

wp-cron-cli.php

<?php

// Author: Kaspars Dambis <hi@kaspars.net>
// Usage: php wp-cron-cli.php --domain=example.com [--path=/path/to/wordpress]

if ( php_sapi_name() !== 'cli' )
	die;

$_SERVER = array_merge(
	$_SERVER,
	array(
		'SERVER_PROTOCOL' => 'HTTP/1.0',
		'REQUEST_METHOD' => 'GET',
		'REMOTE_ADDR' => '127.0.0.1',
	)
);

$opts = getopt( null, array(
        'domain::',
        'path:',
) );

// WordPress uses the domain name to resolve DB settings, etc.
if ( isset( $opts['domain'] ) )
        $_SERVER['HTTP_HOST'] = $opts['domain'];
else
        die( 'Please specify the --domain option.' . PHP_EOL );

// Resolve WordPress cron
if ( isset( $opts['path'] ) )
        $path = $opts['path'] . '/wp-cron.php';
else
        $path = dirname( __FILE__ ) . '/wp-cron.php';

if ( ! file_exists( $path ) || ! is_file( $path ) )
        die( sprintf( 'Can not find %s.' . PHP_EOL, $path ) );

// Run WordPress cron
require_once( $path );