Why does this not seem to work? (array)

[konidias]

NPC Code:

---

 setarray this.items,sarraylen(client.invitems);

 for (a=0;a<this.items;a++ {

   this.items[a] = a;

 }

---

I'm trying to make it set a variable array for "this.items".

client.invitems is just a string:
client.invitems=0,1,2,3,4

Now, it should set the array length to the string array length, which is 5. Then it runs a for loop to set each array slot to the proper value corresponding the string array.

So basically it should go:
client.invitems=0,1,2,3,4

translates to:
this.items{0,1,2,3,4}


But it isn't working. Any suggestions?