Merge pull request #3 from EpicVoyage/master

Added basic introduction to PHP workers.

docs/configuration/procfile.md

@@ -10,7 +10,7 @@ worker: background_worker
 
 ## Worker Types
 
-`piku` supports six different kinds of worker processes:
+`piku` supports seven different kinds of worker processes:
 
 ```bash
 # A module to be loaded by uwsgi to serve HTTP requests
@@ -33,6 +33,15 @@ Each of these has slightly different features:
 
 Also, in this mode `uwsgi` will talk to `nginx` via a Unix socket, so you don't need to worry about the HTTP server at all.
 
+### `php`
+
+`php` workers will execute PHP code in files with the `.php` extension and serve other files. For security reasons, files with the '.inc' extension are not executed.
+
+!!! note
+You will need to install the [uwsgi-plugin-php](https://packages.debian.org/stable/web/uwsgi-plugin-php) package for Debian-based systems, such as Ubuntu, or the equivalent for your distro. This package is available for Ubuntu [20.04](https://packages.ubuntu.com/focal/uwsgi-plugin-php) and [24.04](https://packages.ubuntu.com/noble/uwsgi-plugin-php), but seems to have been withdrawn from 22.04.
+!!! note
+If you place a `php.ini` file in the root of your app, the PHP interpreter for this app will ignore the default system `php.ini`. If your distro is configured to include additional files from an auxiliary directory, those files will continue to be processed.
+
 ### `web`
 
 `web` workers can be literally any executable that `uwsgi` can run and that will serve HTTP requests. They must (by convention) honor the `PORT` environment variable, so that the `nginx` reverse proxy can talk to them.