Example:

javascript:

var mycourses=new Array(); 
mycourses[0]="History";       
mycourses[1]="Math";
mycourses[1][0]="Introduction to math";
mycourses[1][1]="Math 2";
mycourses[1][2]="Math 3";

PHP will then run these values through functions (please note values are mostly not strings as in the example above but rather numbers), the functions will return some text which will than be displayed in a form

How should I go about doing this?

p.s.: I found some similar stuff, but nothing quite like this... as far as I see I will have to use JSON (is there a way to code it from JS automatically - saw this for strings) and AJAX