phpDocumentor (also known as phpdoc and phpdocu) is a documentation tool for your PHP source code. It has an innumerable amount of features, including the ability to output in HTML, PDF, CHM and XML DocBook formats, and has both a Web-based and command-line interface as well as source-code highlighting. To learn more about phpDocumentor, check out the online manual.
An AJAX-powered PHP documentation search engine that enables you to search titles from all PHP documentation pages.
PHP Security Tools
Securimage is a free, open-source PHP CAPTCHA script for generating complex images and CAPTCHA codes to protect forms from spam and abuse.
Scavenger is an open-source, real-time vulnerability management tool. It helps system administrators respond to vulnerability findings, track vulnerability findings and review accepted and false-positive answered vulnerabilities, without “nagging” them with old vulnerabilities.
PHP-IDS (PHP-Intrusion Detection System) is a simple-to-use, well-structured, fast and state-of-the-art security layer for your PHP-based Web application.
Pixy: PHP Security Scanner
Pixy is a Java program that performs automatic scans of PHP 4 source code, aimed to detect XSS and SQL injection vulnerabilities. Pixy takes a PHP program as input and creates a report that lists possible vulnerable points in the program, along with additional information for understanding the vulnerability.