[PHP] Draw function diagram

[Khorosh Irani]

Hello
I have a function like (y(x)=sin(x)) that i convert it to post fix and then
execute it.means that i coud get y for each x value
now I have a simple question
I want to draw diagram of function.
how I should do this
I dont work with gd and also i donot now how I should done this.but i think
that i should get a range for x and get y for each x but i dont know how I
shold draw diagram after this
Thanks
Excuse me for my bad english