For a website, sometime we used more than a script that separated, yes separated and dont have connection at all each other for example domain.com is a forum, using vbulletin domain.com/blog is a blog, using wordpress domain.com/store is ecommerce, using oscommerce domain.com/article is article cms, using joomla etc so for security best practice, like if one of the script get hacked or get something wrong, another script files in another folder, and another mysql database, is still secure can we do that? if so how to do that actually? its looks like simple and basic, but i am still not sure how to do it if there is tutorial link please let me know too, still cant found it