Zend is multi-platform compatible. Zend has rewritten the PHP scripting engine to feature a modular architecture, vastly improved performance, and greater scalability.
Two PHP web-based message boards exist at Zend, including one that focuses on general PHP questions of all flavors and one that is specific to the Zend Optimizer for PHP.
This article was written for web developers and programmers considering PHP as an alternative. Both the history and major features of PHP are discussed.
"This tutorial starts with the simple constructs used to create strings and moves through to more advanced techniques for string handling."
This lengthy article by Zeev Suraski includes a brief history of PHP, explanations of where they went wrong in previous versions, the design changes made in PHP 4, and more.
This article is intended for those with knowledge of PHP who want to avoid some of the most common serious mistakes. The topics included cover databases, security, and much more.
This article, although intended for anyone getting started with PHP, will be most useful to those who have some experience in Perl, JavaScript, or VB/ASP.
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Java and C++ programmer mostly confuses the Reference and Alias mechanisms of PHP. This small tip will help you to understand these. There is also a simple but very interesting code included.
This tutorial explains how to initiate user authentication and then use variables to verify which users are accessing your pages, using a flat text file or more complex database system. | 
