This article is the first installment of a five-part series of articles covering xdebug, a free and open source swiss army knife tool for PHP developers.
PHP 5.3: SPL stack, heap, queue, list - Lorenzo Alberton
Following my recent experiments with the new SPL features in PHP 5.3, I saw that there are some new SPL data structures: heap, stack, queue and linked list. They aren't documented yet but I had a peek at the C sources
Testing PHP/MySQL Applications with PHPUnit/DbUnit - Sebastian Bergmann
Here is the presentation material I used for my "Testing PHP/MySQL Applications with PHPUnit/DbUnit" presentation at the MySQL Conference in Santa Clara, CA today.