6-3-3-1 過濾接收變數，寫入資料庫

//檢查並傳回欲拿到資料使用的變數
//$title = '' 則非必填
function db_CleanVars($var, $title = '', $filter = '')
{
  global $db;
  #寫入資料庫過濾
  $var = $db->real_escape_string($var);

  if($title){
    if($var === "")redirect_header(WEB_URL, 3000, $title . '為必填！');
  }

  if ($filter) {
    $var = filter_var($var, $filter);
    if (!$var) {
      redirect_header(WEB_URL, 3000, "不合法的{$title}");
    }
  }
  return $var;
}