Twig - The flexible, fast, and secure template language for PHP
http://www.twig-project.org
"When it comes to template languages in PHP, many people will tell you that PHP itself is a template language. But even if PHP started its life as a template language, it did not evolve like one in the recent years. As a matter of fact, it doesn't support many features modern template languages should have nowadays"
PHPTAL :: Template Attribute Language for PHP
http://phptal.motion-twin.com
"PHPTAL is a templating engine for PHP5 that implements brilliant Zope Page Templates syntax"
Home – Kohana: Swift, Secure, and Small PHP 5 Framework
http://www.kohanaphp.com/home.html
My current favorite PHP framework. Strangely, I found I hadn't bookmarked this already.
Photo Matt » On PHP
http://photomatt.net/2007/07/13/on-php
"None of the most requested features for WordPress would be any easier (or harder) if they were written for PHP 4 or 5 or Python. They’d just be different."
Zend Technologies - PHP 5 In Depth - XML in PHP 5 - What's New?
http://www.zend.com/php5/articles/php5-xmlphp.php#Heading18
"One of the latest features added to the XSLT extension is the ability to call any PHP function from within an XSLT stylesheet. While XML/XSLT purists will certainly dislike this.., it can be very useful in some special cases."
symfony Web PHP framework
http://www.symfony-project.com
"Based on the best practices of web development, thoroughly tried on several active websites, symfony aims to speed up the creation and maintenance of web applications, and to replace the repetitive coding tasks by power, control and pleasure."