File extension for PHP's serialization format?

[Hamish Lawson <hbl@xxxxxxxxxxxxxxxx>]

I have a web application (not written in PHP) that can return data in 
various formats, including JSON and PHP's serialization format. At the 
moment my URL scheme looks like this:

    staff/engineering?format=json

but I'd like to switch to using a file extension to denote the format:

    staff/engineering.json

But what file extension should I use for PHP's serialization format? 
Obviously it can't be .php - aside from being inaccurate (it's not PHP 
code), using this extension would probably trigger the web server into 
trying to run a (nonexistent) PHP script.

Thanks,
Hamish Lawson

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