Patch for /trunk/src/php/jsonpath.php

```
Set a default value for vname. It is never used in the function, but without it 
earlier trace functions might not work.
```

Original issue reported on code.google.com by `jest...@gmail.com` on 17 Aug 2012 at 7:04

Attachments:
- [jsonpath.php.patch](https://storage.googleapis.com/google-code-attachments/jsonpath/issue-23/comment-0/jsonpath.php.patch)
