error with certain excel file

```
What steps will reproduce the problem?
1. use the attached excel
2. print value of certain cell

What is the expected output? What do you see instead?
Warning: array_key_exists(): The second argument should be either an array or
an object in /{file path}/excel/excel_reader2.php on line 348

Please provide any additional information below.
pls advice how to fix it!

thanks a lot!
```

Original issue reported on code.google.com by `pe...@perfectlink.com.hk` on 10 Nov 2011 at 8:30

Attachments:
- [registration.xls](https://storage.googleapis.com/google-code-attachments/php-excel-reader/issue-131/comment-0/registration.xls)

Start at excel/excel_reader2.php line 348 and reproduce the warning by opening the attached registration.xls and printing the affected cell. Inspect the value passed to array_key_exists at that point. Done means the file loads without this warning and the requested cell value is printed correctly.

Written by the indexing model from the issue text.