External References about Maintaining and Extending PHP

Books

• Extending and Embedding PHP Sara Golemon's book on PHP (2006)
• Advanced PHP Programming George Schlossnagle's book has several relevant chapters (2004)

Blog Posts and Articles

• Blog Series on Internals by Anthony Ferrara & Nikita Popov (2012)
  • PHP's Source Code For PHP Developers - Part 1 - The Structure
  • Understanding PHP's internal function definitions (PHP's Source Code for PHP Developers - Part 2)
  • PHP's Source Code For PHP Developers - Part 3 - Variables
  • Understanding PHP's internal array implementation (PHP's Source Code for PHP Developers - Part 4)
• Fixing a bug in php-src François Gannaz describes making his very first bug fix (2012)
• PHP Extensions Made Eldrich Series by Kristina Chodorow (2011)
  • PHP Extensions Made Eldrich: Installing PHP
  • PHP Extensions Made Eldrich: Hello, World!
  • PHP Extensions Made Eldrich: PHP Variables
  • PHP Extensions Made Eldrich: Classes
• Valgrinding shared modules Derick Rethans (2011)
• Debugging Variables Derick Rethans (2011)
• PHP's segmentation faults GDB-fu Derick Rethans (2011)
• References and foreach Blog post by Johannes Schlüter (2010)
• Wrapping C++ Classes in a PHP Extension Zend DevZone article (2009)
• Understanding Opcodes Blog post by Sara Golemon (2008)
• You're being lied to Blog post on references by Sara Golemon (2007)
• What the heck is TSRMLS_CC, anyway? Blog post by Sara Golemon (2006)
• Compiled Variables Blog post by Sara Golemon (2006)
• Zend DevZone Series by Sara Golemon (2005, 2006)
  • Extension Writing Part I: Introduction to PHP and Zend
  • Extension Writing Part II: Parameters, Arrays, and ZVALs
  • Extension Writing Part II: Parameters, Arrays, and ZVALs (continued)
  • Extension Writing Part III: Resources

Conference Slides

• PHP Extension Writing Conference slides by Johannes Schlüter and Marcus Börger (2009)
• Extending PHP Conference slides by Wez Furlong (2003)

Official Documentation/Source

• Various README files within the php-src like:
  • README.PARAMETER_PARSING_API
  • README.UNIX-BUILD-SYSTEM
  • README.STREAMS
• http://php.net/internals2
• HOWTO create documentation for a PECL extension
• internals documentation within this wiki