How to factor apache httpd configuration?

Question

I have a php application my_application, that needs to be ran in three specific ways (namely, dev, test, and prod) by httpd.

That very application is deployed many times, one for each client (with its own subdomain);

So, in the end I have that kinds of URLs:

dev-client1.myapp.mycompany.com
test-client1.myapp.mycompany.com
client1.myapp.mycompany.com

dev-client2.myapp.mycompany.com
test-client2.myapp.mycompany.com
client2.myapp.mycompany.com

And for each of these domains, I have a apache virtual block, when all I would need is a way to specify two configuration files, and the URL associated. (One for the client configuration, one for the test-dev-prod configuration).

What is the proper way of reducing the copy and paste of httpd conf in this scenario ?

for instance, a way of doing that :

register_myapp("dev-client1.myapp.mycompany.com", "myapp.php?db_access=client1.ini&configuration=dev");
or
register_myapp("dev-client1.myapp.mycompany.com", "myapp.php", "client1.ini", "dev");

or something like that, instead of :

<VirtualHost *:80>
    DocumentRoot "/var/www/myapp"
    ServerName dev-client1.myapp.mycompany.com
    <Directory "/var/www/myapp">
        AllowOverride none
        Options Indexes FollowSymLinks
        Require all granted
    </Directory>
    RewriteEngine On
    RewriteRule ^.*$ start.php?client=client1.ini&version=dev
</VirtualHost>

duplicated 3n times.

Edit : Currently, my configuration is in fact :

RewriteRule ^.*$ client1/start_dev.php

But that doesn't satisfy me either, because it makes too many duplication as well.

Answer 1

<VirtualHost *:80>
    DocumentRoot "/var/www/myapp"
    ServerName client1.myapp.mycompany.com
    ServerAlias dev-client1.myapp.mycompany.com

    <Directory "/var/www/myapp">
        AllowOverride none
        Options Indexes FollowSymLinks
        Require all granted
    </Directory>
    RewriteEngine On
    RewriteRule ^.*$ start.php
</VirtualHost>

And put your running environment in a non-versioned local .env or config file