I need to build a forum as my final year project.what is the best way to buil it.?

Codeignitor, If you don't wanna write basic things

Have you tried either of these options? - Simple Machines Forum https://www.simplemachines.org/ or - Content Management System like Joomla? https://www.joomla.org/

i like your idea. you can build it with php and sql.Here is a example https://code.tutsplus.com/tutorials/how-to-create-a-phpmysql-powered-forum-from-scratch--net-10188 one more thing is forum is not made for giving answer from web we use Google for that.

no not yet

Is it okey to go with wordpress?

Yeah, wordpress is also another CMS (Content Management System)

MR programmer thats a nice tutorial.but I need a nnatural language processing part to filter the questions.

If you really want to learn all the web foundation from the ground up, this final year project is the best chance to do it. I would advise you to do the following for your final year project: • Learn some Photoshop/Illustrator in web design, design the web layout, logo and objects. • Use Html5, Css, JavascriptES5 to build the front-end. • Use Php7 and Mysql to build the backend • Use Ajax or Rest Api for the front and back-end interaction. • Don't use any prebuild CMS, like WordPress or Jomla • Don't use Bootstrap, you can build all these components from Css and Javascript. • Don't use jQuery or any Javascript framework, you can build all Javascript libs from Javascript itself. • Don't use Php framework, use only Php7 to build all the libs (or MVC libs if you prefer)

add a new column in the sql table called subject and now you can filter by subject using small sql query

This can be done easily with PHP/MySQL. However, you will have to learn these languages first or get some dev to do it. If you want to do it yourself, there are some great youtube channels to learn programming (https://www.cloudways.com/blog/best-youtube-channels-to-learn-programming/ )

nodeBB is another option

thanx calvin its a nice idea and its impressed me

Try this open source PHP/Mysql forum, https://www.mysqlajaxforum.com, and maybe you can learn something by studying the code.