Have had similar phone screen experiences for various roles, and sometimes the screener seemed to understand that I had a lot more knowledge/experience they did, and trusted my explanations, because I'd talk to them some more and explain the answer (their answer) in more detail back to them. Some of them may have thought I was completely BSing them, but a few seemed to grok I was more than qualified based on the answers and put me through.
Also took a computer-based test at a recruiter once, re: PHP, and it was... 20 questions. One of the questions was wrong, in that the syntax of the question as posted was incorrect. Pointed that out, and got a "thank you, we'll call you" kick out the door.