HTML Purifier Posting Arrays

$getdata = $_POST['getdata'];
/**
 * myFilter()
 * 
 * @return
 */
function myFilter($value) {
 global $purifier;
 $value = $purifier->purify($value);
 return $value;
}
$getdata = array_map("myFilter",$getdata);
print_r($getdata);