phpruuner no row change field to custom

View Custom
if($_SESSION['last_date'] != $data['Datum'])
{
    $_SESSION['Rang'] = 0;
    $_SESSION['last_date'] = $data['Datum'];
}
else
{
    $_SESSION['Rang']++;
}

$value = $_SESSION['Rang'];

In Before Process event

$_SESSION['last_date'] = '';
$_SESSION['Rang'] = 0;

// Place event code here.
// Use