WordPress Cron Daemon

example.php

<?php
/*
 * Plugin Name: Cron Daemon
 * Plugin URI: https://cramer.co.za
 * Description: Simple plugin to daemonize the WordPress Cron. 
 * Version: 1.0.0
 * Author: David Cramer
 * Author URI: https://cramer.co.za
 * License: GPL2+
*/

// If this file is called directly, abort.
if ( ! defined( 'WPINC' ) ) {
	die;
}
// Run only if DOING CRON and daemon_running is false.
if ( defined( 'DOING_CRON' ) && ! get_transient( 'daemon_running' ) ) {
    set_transient( 'daemon_running', true ); // Flag transient as running.
    register_shutdown_function( function () {
        sleep( 1 ); // Sleep to give time to update and to set cycle time.
        set_transient( 'daemon_running', false ); // Flag transient as not running.
		$args = array(
			'timeout'   => 0.01,
			'blocking'  => false,
			'sslverify' => false,
		);
		wp_remote_post( site_url( 'wp-cron.php?doing_wp_cron' ), $args );
    } );
}