What are common issues that can arise when using .htaccess to redirect to index.php in PHP websites?

One common issue that can arise when using .htaccess to redirect to index.php in PHP websites is that the redirection may cause an infinite loop, resulting in a "too many redirects" error. To solve this issue, you can add a condition in the .htaccess file to only redirect if the requested file does not exist.

RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^ index.php [L]