Code standard "pg_roboxchange"

Hi

When write logs ?

```php
fwrite($fp, "answer:" . $answer . " code " . $crc);
fwrite($fp, print_r($_GET, TRUE));
fclose($fp);
echo $answer;
```

https://github.com/DrupalCodeReview/pgapi/blob/master/pg_roboxchange/pg_roboxchange.admin.inc#L198