_set_cron_array example

        return false;
    }

    $crons[ $event->timestamp ][ $event->hook ][ $key ] = array(
        'schedule' => $event->schedule,
        'args'     => $event->args,
    );
    uksort( $crons, 'strnatcasecmp' );

    return _set_cron_array( $crons, $wp_error );
}

/** * Schedules a recurring event. * * Schedules a hook which will be triggered by WordPress at the specified interval. * The action will trigger when someone visits your WordPress site if the scheduled * time has passed. * * Valid values for the recurrence are 'hourly', 'daily', and 'twicedaily'. These can * be extended using the {@see 'cron_schedules'} filter in wp_get_schedules(). * * Use wp_next_scheduled() to prevent duplicate events. * * Use wp_schedule_single_event() to schedule a non-recurring event. * * @since 2.1.0 * @since 5.1.0 Return value modified to boolean indicating success or failure, * {@see 'pre_schedule_event'} filter added to short-circuit the function. * @since 5.7.0 The `$wp_error` parameter was added. * * @link https://developer.wordpress.org/reference/functions/wp_schedule_event/ * * @param int $timestamp Unix timestamp (UTC) for when to next run the event. * @param string $recurrence How often the event should subsequently recur. * See wp_get_schedules() for accepted values. * @param string $hook Action hook to execute when the event is run. * @param array $args Optional. Array containing arguments to pass to the * hook's callback function. Each value in the array * is passed to the callback as an individual parameter. * The array keys are ignored. Default empty array. * @param bool $wp_error Optional. Whether to return a WP_Error on failure. Default false. * @return bool|WP_Error True if event successfully scheduled. False or WP_Error on failure. */

/** * Executes changes made in WordPress 4.3.1. * * @ignore * @since 4.3.1 */
function upgrade_431() {
    // Fix incorrect cron entries for term splitting.     $cron_array = _get_cron_array();
    if ( isset( $cron_array['wp_batch_split_terms'] ) ) {
        unset( $cron_array['wp_batch_split_terms'] );
        _set_cron_array( $cron_array );
    }
}

/** * Executes changes made in WordPress 4.4.0. * * @ignore * @since 4.4.0 * * @global int $wp_current_db_version The old (current) database version. * @global wpdb $wpdb WordPress database abstraction object. */