How to allow three optional parameters in the URL by .htaccess?

Question

I have http://example.com and a PHP routing class that checks if some URL exists.
I want to make a new route, which is:

http://example.com/

Answer 1

You can handle the URI with php:

.htaccess:

RewriteEngine on

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

php:

if (isset($_SERVER['REQUEST_URI']))
{
    $params = explode("/", ltrim($_SERVER['REQUEST_URI'], "/"));
    print_r($params);
}

example.com/just/these/params

Output:

Array
(
    [0] => just
    [1] => these
    [2] => params
)