I am using [Timber](https://timber.github.io/docs/) with Wordpress (version 5.4.2). I have installed Timber's [starter theme](https://timber.github.io/docs/getting-started/setup/#use-the-starter-theme) as a boilerplate.

Timber leverages the Wordpress template hierarchy allowing you to create a [custom PHP file for a given route](https://timber.github.io/docs/guides/custom-page-templates/#custom-php-file).

**Page.php (default in Timber starter theme)**

```
/**
 * The template for displaying all pages.
 *
 * This is the template that displays all pages by default.
 * Please note that this is the WordPress construct of pages
 * and that other 'pages' on your WordPress site will use a
 * different template.
 *
 * To generate specific templates for your pages you can use:
 * /mytheme/templates/page-mypage.twig
 * (which will still route through this PHP file)
 * OR
 * /mytheme/page-mypage.php
 * **(in which case you'll want to duplicate this file and save to the above path)**
 *
 * Methods for TimberHelper can be found in the /lib sub-directory
 *
 * @package  WordPress
 * @subpackage  Timber
 * @since    Timber 0.1
 */

$context = Timber::context();

$timber_post = new Timber\Post();

$context['post'] = $timber_post;

Timber::render( [ 'page-' . $timber_post->post_name . '.twig', 'page.twig' ], $context );

```

As per the comments in page.php and the Timber docs, I can create a custom PHP file to load a template for a given page by create it in the root directory of the theme (`mytheme/my-custom-php-file.php`)

But I will be creating a lot of custom PHP files for the project I'm working on - it would be pretty messy and hard to manage if I just drop them all into the root directory of the theme.

I would instead like to place these files into their own directory `mytheme/src/`. ex. `mytheme/src/my-custom-php-file.php`.

Currently, Timber/Wordpress will not recognize this file in this directory.

Where in Timber and/or Wordpress is the directory in which to look for pages' PHP files defined and how can I update this to indicate `mytheme/src/`?