From LearnComputer.com there's a few hints they've put together that might help you with that next PHP-related job interview.
So youâ€™ve been slinging resumes for a while and now you have an interview for an awesome PHP job. While part of the interview will be the typical job interview, you should also be prepared for a technical interview. Technical interviews are often given to determine how well you truly know the technologies with which youâ€™ll be working. There are numerous books and articles to help you prepare for the job interview portion but very little has been said on preparing for a PHP technical interview.
They've broken down their advice into a few different sections including some sample PHP questions you might get asked about both PHP and MySQL, a quick look at frameworks and the recommendation of the book PHP and MySQL Web Development to help round out your knowledge.