One of the more well-known people in the PHP community, George Schlossnagle has a new book out for anyone that needs to take that next step to really harness the power of PHP.

His book, Advanced PHP Programming covers a wide range of topics, including error checking/handling, designing a good API, session handling, and benchmarking your applications. If purchased through his B&N affiliate link, then not only does he recieve a commission on each purchase, but you also save around ten dollars (USD) to add this fine reference to your library.

From the publisher: Over the past three years PHP has evolved from being a niche language used to add dynamic functionality to small sites to a powerful tool making strong inroads into large-scale, business-critical Web systems. [...] While there are many books on learning PHP and developing small applications with it, there is a serious lack of information on "scaling" PHP for large-scale, business-critical systems. Schlossnagle's Advanced PHP Programming fills that void, demonstrating that PHP is ready for enterprise Web applications by showing the reader how to develop PHP-based applications for maximum performance, stability, and extensibility.