Jason Gilmore has put together a list of sixteen best practices and tools you can use to help make your PHP development life easier and the quality of your code better.
[I spent so] much time in fact that in 2010 I penned more than 130 articles. Many of these articles focused on PHP-specific best practices and productivity, two topics which should resonate closely with anybody involved in building websites for a living. So I thought it would be useful to compile a list of the sixteen tutorials which touch upon these topics. In this list you'll find tutorials introducing testing, debugging, advanced object-oriented features, code profiling, security, enforcing coding standards, and more.
His list of articles includes: