Untitled

How to send an empty array from JS to PHP using JSON?
<?
if ($_GET['test']) {
    $data = $_GET['data'];
    print_r($data);
    exit;
}
?>
<head>
    <script type="text/javascript" src="jquery-1.6.4.min.js"></script>
</head>
<script type="text/javascript">
    $.getJSON('temp.php', {
        "test": 1,
        "data": []
    })
</script>

if (! isset($data = $_GET['data']))
    $data = array();

$.getJSON('temp.php', {
    "test": 1,
    "data": JSON.stringify([])
})