serverwarp() doesn't work serverside

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So I was testing some stuff on jothegreat55555's server, and I tried to make a relog/disconnector (to work on other people), and it doesn't work serversided.

This is the errors in RC that I get

PHP Code:

Script: Function serverwarp not found at line 4 in script of SwitchTest (in level lc_a1.nw at pos (0, 0))
Script: Function serverwarp not found at line 8 in script of SwitchTest (in level lc_a1.nw at pos (0, 0)) 


The first line is using "/relog", the second is using "/disconnect" (obviously).

This is the script I'm using

PHP Code:

function onActionServerSide() {
  if (params[0] == "/relog") {
    with (findPlayer(params[1]))
      serverwarp(servername);
  }
  if (params[0] == "/disconnect") {
    with (findPlayer(params[1]))
      serverwarp("Login");
  }
}

//#CLIENTSIDE
function onPlayerChats() {
  temp.token = player.chat.tokenize();
  if (player.chat.starts("/relog"))
    triggerserver("gui",this.name,temp.token[0],temp.token[1]);
  if (player.chat.starts("/disconnect"))
    triggerserver("gui",this.name,temp.token[0],temp.token[1]);
} 


My question is, is there any way that it will work serversided, or can it be implemented to be serversided?

Not really necassery, I just think it's kind of odd how switching servers seems to be more like something serversided, not clientsided.