How to control webpages via PHP?

I want to login into a website, make some choices there, submit and logout.

Not so impressive by itself, but I want to do it with PHP. And without cURL, as it is no开发者_开发问答t installed on my server.

How do I do it?

without cURL, you'll need to use PHP's Stream functions, which can accomplish the same things, if with slightly more code. Start with stream_context_create and work your way through the manual