Find And Replace Script Coding

Dear php experts, I need a script to insert it to my forum like this
Users write page, it will be change auto into a link
please help me

 

Don't get what you need? please give more info, what for kind of forum?

 

Dear Look, We Write Here Simple Face.book (with Out Dot)
It Changed Into A Link Auto
I Want Same Option In My forum

 

I think i get what you need, you want words to be replaced with links

example:
this is a text about facebook and twitter

and then you would like to replace for example facebook/twitter with links to the website? what forum are you using?

 

yEs yESs Dear Exactly ..

 

Then again, what forum are you using?

 

XenForo

 

XenForo has a great archive with plugins
http://xenforo.com/community/resources/categories/add-ons.28/

this would do the job i think
http://xenforo.com/community/resources/tinhte-xentag.770/

 

You could also have the file read and find the keyword. Then string replace those words with the full link and keyword.