I have a pretty comprehensive list of chapters, but I'm still adding content to the book, so if you guys have any ideas or suggestions for topics you'd like to see covered, feel free to email me or post them here. Thanks so much!
I'm very interested what differences microptimizations (like using while(list() = each()) instead of foreach) make when scaling.
Also, I noticed that when I clicked the return to website after clicking on the subscribe button your website, it went to google.com instead, and when I clicked continue to our website button after clicking the email confirmation link, it went to http://www.phpscalingbook.com/ (404 error).
And if you need any proofreaders, I'd be more than happy to help!
On a typical LAMP web site the hottest bottlenecks are usually PHP is waiting for database I/O, it's not typical that slight code optimizations will produce a dramatic improvement.
I'd be interested in your opinion about premature optimizations and how your experiences with bottlenecks matched up compared to your initial expectations. I often find myself overthinking performance and scalability issues that turn out to be not relevant in the end...
