test1.php -----------------
<?
$arr = Array();
$arr = serialize($arr);
$arr = base64_encode($arr);
?>

<a href="test2.php?arr=<?echo $arr?>">Next</a>
----------------- test1.php

test2.php -----------------
<?
$arr = base64_decode($arr);
$arr = unserialize($arr);
$arr[0] = 0;
$arr[1] = 1;
$arr[2] = 2;
$arr[3] = 3;
$arr = base64_encode(serialize($arr));
?>

<a href="test3.php?arr=<?echo $arr?>" >Next</a>
----------------- test2.php

test3.php -----------------
<?
$arr = base64_decode($arr);
$arr = unserialize($arr);
print_r($arr);
?>
----------------- test3.php

bofh