Pass array from URL to javascript

How can i pass an array from a GET request like this:

[x, y], [x, y]...

Into the second part of this google visualization API call.

var data = google.visualization.arrayToDataTable([
['Initial', 'Second'],
[8, 37], [4, 19.5], [11, 52], [4, 22], [3, 16.5], [6.5, 32.8], [14, 72]]);

Currently i have the values pre-set, but i would like to pass them from a GET request. I have tried using PHP for this however failed using methods like this passing arrays as url parameter as i am not quite sure how to set the x value properly.