Do you mean like this?
I don't know if the license terms or costs fit your use. If you want something more open, as I suspect you do, then you're best off searching source forge. You will notice that most of the spell checkers use GNU Aspell, like this one
Checking grammar is a bit more involved though.
--- In firstname.lastname@example.org, "cooldiplomat" <saifab@...> wrote:
> Hello Everyone.
> I have built a test preparation application for GRE using PHP and Mysql.But now I need to add spelling and grammar checking utility in essay writing module.
> Is there any class on php to perform grammar check of a text input field ??
> If you can shed any light on how to add a grammar check utility on a php application,It would be of a great help to me.