I think its better to use Mod-rewrite than using PHP $PATH_INFO, if you use path info, url will look like
article.php/12
You can rename article.php to article and get it work as php file, but have faced some problem when working with phpsuexe on.
You can use following .htaccess file.
Code:
RewriteEngine On
RewriteRule ^/article/([0-9]*) /article.php?ID=$1