if (isset($_POST['data_submitted']))
    {
$data = array();
$name = $_POST['name'];
$pps = $_POST['pps'];
$pin = $_POST['pin'];
$dob = $_POST['dob'];
$Person = new Person($name, $pps, $pin, $dob);
array_push($data, $Person);
$csv="";

foreach ($data as $Person)
{
    $csv.= $name.",".$dob.",".$pps.",".$pin."\n";
    $file = fopen("persistence/person_data.csv", "a");
    fwrite($file, $csv);
    fclose($file);
}
    }