Triggering Functions on other Players

[i8bit]

I'm looking to trigger an action on another player for the combat system I am making.
How do I trigger the hurt function in the other player. (Need help where the // is)

-system/hurt

PHP Code:

//#CLIENTSIDE
function onHurt(){
 player.chat = "Hurt!";
} 


-system/combat

PHP Code:

function onActionServerSide(){ 
 if (params[0] == "attack"){
  //trigger onHurt in the -system/hurt weapon of the player right in front of you
  }
}

//#CLIENTSIDE
function onKeyPressed(code, key){
 if (key == "s"){
  player.chat = "Attack!";
  triggerserver("weapon", this.name, "attack");
 }
} 


side note:
Is triggering a serverside function in an NPC similar to triggering another player?
I need to trigger the onHurt() with the baddies too.