"?" string - Are PHP files index/spidered?

[halbesma]

Do search engines index/spider PHP files with "?" string?

Cheers,
John

[Dijkgraaf]

That depends on the search engine, and also how many parameters you have after the "?" (the query string).
For examply one version of Googlebot will only follow two parameters, whereas another one will follow multiple paramers.

You should also avoid parameters called SessionID or ID in your query string, as these could be igorned by search spiders/crawlers.