I want to run blah.php via htaccess that it runs everywhere when any page loads.
I searched lots of documents and I see they are using regular expression to pass values to php files to make a seo friendly link. But I don't need to pass any values to my php, I want to simply run blah.php via my .htaccess. Please simply tell me how the htaccess command should look like?

I tried this RewriteRule ^.*$ blah.php [L] but this is an infinite redirect which I don't want. please advice.