quizlet/oauth2-php — pull request #20 by gzm0 (2012-07-19 06:54:19+00:00)
Title: Exception Thrown when (possibly valid) client_id evaluates to false

```OAuth2::getAuthorizeParams``` throws an exception, if the GET client_id parameter evaluates to false in PHP. Replaced
```if (!$input["client_id"])```
with
```if (!isset($input["client_id"]))```.