Load css and js along with htaccess

Explain where you are keeping the js and css. Also show code on how you try to load those assets. Might be good to share your .htaccess too.

Code:

DirectoryIndex index.php
RewriteEngine On

RewriteCond %{SCRIPT_FILENAME} !-d
RewriteCond %{SCRIPT_FILENAME} !-f
RewriteRule ^ index.php [L]

RewriteRule !^(public/|index\.php) [NC,F]

Just now, I found a (temporary) solution.
It's using file_get_contents() to get the content of the file as a string, then return the value (using echo) through controller, which can be accessed by url (like how a function in controller is called).

My next question is, is the method safe? (since the only scripts accessible to users are css and js scripts)