public static function generateId()
{
$salesman = Salesman::orderBy('salesID', 'DESC')->get()->first();
$salesId = $salesman->salesID;
$salesId = substr($salesId, 2);
$newId = (int) $salesId;
$newId++;
$newIdString = (string) $newId;
$newIdString = "000000" . $newIdString;
if (strlen($newIdString) > 3) {
$newIdString = substr($newIdString, strlen($newIdString) - 3);
}
$newIdString = "SA" . $newIdString;
return $newIdString;
}
