How to replace the robots.txt file with robots.php in .htaccess?

Question

htaccess

There is an intricate system, once someone made two domains that lead to one folder on the hosting.
Depending on the domain, you need to give different robots.txt.
How to replace the robots.txt file with robots.php in .htaccess? No 301 redirect and no url change.

Answer 1

Eh, sorry, don't specify 301, what's the problem then?

RewriteEngine On
RewriteBase /
RewriteRule ^robots.txt$ /robots.php [L]