One-Page Checkout [Support Thread]

[lat9]

PHP 7.2
ZC verion 156a "classic template"
Up and running with no issues.

How do you disable the display of the header on the "Check Out" Page?
NOTE:
I was able to successfully do this for the "Login" page.

I tried putting a "checkout_one" directory with tpl_header.php un-commenting this code in it per the below instructions.

 $flag_disable_header = true;

The page displays but when I "submit" the order or try to change an address nothing happens.
All other links on the page respond.

NOTE:
I was able to successfully do this for the "Login" page.

* Common Template - tpl_header.php
*
* this file can be copied to /templates/your_template_dir/pagename<br />
* example: to override the privacy page<br />
* make a directory /templates/my_template/privacy<br />
* copy /templates/templates_defaults/common/tpl_footer.php to /templates/my_template/privacy/tpl_header.php<br />
* to override the global settings and turn off the footer un-comment the following line:<br />
? * <br /> */
$flag_disable_header = true;
/*
* @package templateSystem
* @copyright Copyright 2003-2016 Zen Cart Development Team
* @copyright Portions Copyright 2003 osCommerce
* @license http://www.zen-cart.com/license/2_0.txt GNU Public License V2.0
* @version $Id: Author: DrByte Sat Oct 17 22:01:06 2015 -0400 Modified in v1.5.5 $
Yada Yada...

I was able to disable the header on the checkout_one page by adding the file /includes/modules/pages/checkout_one/header_php_no_header.php containing

<?php
$flag_disable_header = true;

To also disable the header on the checkout_one_confirmation page, just copy that file to the /includes/modules/pages/checkout_one_confirmation directory.