(Yaf >=1.0.0)
Any request from client is initialized as a Yaf_Request_Http. you can get the request information like, uri query and post parameters via methods of this class.
Nota:
For security, $_GET/$_POST are readonly in Yaf, which means if you set a value to these global variables, you can not get it from Yaf_Request_Http::getQuery() or Yaf_Request_Http::getPost().
But there do is some usage need such feature, like unit testing. thus Yaf can be built with --enable-yaf-debug, which will allow Yaf read the value user set via script.
in such case, Yaf will throw a E_STRICT warning to remind you about that: Strict Standards: you are running yaf in debug mode