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ASP used to be quite popular some10years back but now, Its PHP.
There are a lot of opensource projects being developed as well as being maintain in PHP such as CMS systems like Wordpress, joomla drupal and a lot of other web based system.
There are also a lot of frameworks being maintain in php like CakePhp, Laravel, Symfony, Zend etc...
So I will suggest PHP being the best.
What are the web project goal, scope & objectives? These will guide to answer your question.
Have a nice day :)