Request Query Parameter Documentation

[joshpaulchan]

I'm not exactly sure this would be the (only? best?) place to put it, but it would be nice to give a few examples of what the slim\psr7 implementation ofServerRequestInterface->getQueryParams() typically does - especially with respect to URL decoding and multiple query arguments. Briefly:

// given `http://some.url/?filter=1&filter=2&filter=3,4` what comes out of here?
$request->getQueryParams()

I ultimately had to look through the slim/psr7 source to find the answer - and I think even surfacing that it's implemented using parse_str and a link to the PHP reference for that function would be adequate.. Later on I also saw a small note in the PSR-7 documentation, but the implications of how that relates to query parameters weren't immediately obvious to me.

• • Query string arguments (generally via $_GET, or as parsed via parse_str())

If that makes sense and seems like something we'd want, happy to provide a PR!