References

• PHPLint
  www.icosaedro.it/phplint/
  Official WEB site of the PHPLint project.

• PHP: Hypertext Preprocessor
  www.php.net
  Official WEB site of the PHP programming language.

• Zend Technologies Ltd.
  The developers of the "core" PHP interpreter.
  www.zend.com

• Programming PHP
  Rasmus Lerdorf, Kevin Tatroe
  O'Reilly (2002), reprint 11/4
  ISBN 1-56592-610-2

  A bit outdated (it does not cover PHP 5) but it explains the fundamentals at the base of the PHP language. Very interesting the section about the application techniques and the section about the development of PHP extensions, those that about the PHPlint terminology are called "modules". A "must read" for every PHP programmer.

• PHP 5 Power Programming
  Andi Gutmans, Stig Bakken, Derick Rethans
  Prentice Hall PTR (2004)
  ISBN 013147149X
  www.phptr.com