RewriteEngine On

RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f

RewriteRule ^ruid.php(/t(d))?/r([d]{2,4})x(d{2,4})?/([a-zA-Zd_-])$ ruid.php?type=$2&width=$3&height=$4&image=$5 [L, QSA]

// returns array(0){}
die(var_dump($_GET));