Canceling Events

Let's say I want to create a plugin that mutes a player... (Don't tell me that they already exist I KNOW!)
I want to listen in on the player.chat event, then when the player attempts to say something, it cancels the event so the player can't say anything...

Is this possible? If so, how?

Thank you, would it just be like this?

PHP:

 public function onPlayerChat($player){
       //Player chat event
       case player.chat
           return false;
           break;
     }

Ok thanks!

After returning false, the function is escaped and no need, nor would it be read, the break.

I think just do return false