private function checkType($var)
    {
        switch (gettype($var)) {
            case "resource":
                $this->varIsResource($var);
                break;
            case "object":
                $this->varIsObject($var);
                break;
            case "array":
                $this->varIsArray($var);
                break;
            case "NULL":
                $this->varIsNULL();
                break;
            case "boolean":
                $this->varIsBoolean($var);
                break;
            default:
                $var = ($var == "") ? "[empty string]" : $var;
                echo "<table cellspacing=0><tr>\n<td>" . $var . "</td>\n</tr>\n</table>\n";
                break;
        }
    }