Here are two options for passing an array via GET parameters (in a url):

<A href="example.html?arr[]=val1&arr[]=val2&arr[]=val3">test</A>

<A href="example.html?arr=<?PHP echo serialize($arr); ?>">test</A>

In the first example, you can use $_GET["arr"] as an array.
In the second you will first have to:

<?PHP 
 $arr = unserialize($_GET["arr"]); 
?>

http://www.webmasterworld.com/forum88/5808.htm

Passing an array through GET request

url, array

PHP