Referências sobre PHP

Site Oficial PHP.net
http://www.php.net/

Documentação
http://www.php.net/manual/pt_BR/

PHPClasses
http://www.phpclasses.org/

PHP Brasil
http://www.phpbrasil.com/

Coluna de PHP do iMasters
http://www.imasters.com.br/secao/php

Tutoriais Básicos de PHP
http://www.truquesed...s/php/index.htm

Tutoriais do criarweb.com
http://www.criarweb.com/php/

PHPDemos
http://www.phpdemos.com.br/

Linha de Código - Área de PHP
http://www.linhadeco...vimento/php.asp

PECL
http://pecl.php.net/

PEAR
http://pear.php.net/

Zend FrameWork
http://framework.zend.com/

Smarty
http://smarty.php.net/

Framework PRADO
http://www.pradosoft.com/

PHP GTK
http://www.php-gtk.org.br/

charts
http://www.maani.us/charts/

FPDF
http://fpdf.org/

Turbodbadmin
http://www.turboajax.com/turbodbadmin/

ADOdb
http://adodb.sourceforge.net/

dBug
http://dbug.ospinto.com/

Geshi
http://qbnz.com/highlighter/

Joomla
http://www.joomla.org/

PHPGrid
http://www.phpgrid.com/grid/

Miolo
http://www.miolo.org.br/

AgataReports
http://www.agata.org.br/

Zend
http://www.zend.com

uebimiau
http://www.uebimiau.org/

phpmyadmin
http://www.phpmyadmin.net

PHPDoc
http://www.phpdoc.org/

Framework PHP2Go
http://www.php2go.com.br

PHPReports
http://phpreports.so...et/index_p.html

Winbinder
http://winbinder.org/

PHPEva
http://www.evacms.com.br/

Phalanger
http://www.php-compiler.net/

MyObjects
http://www.myobjects.org/doku.php

legal adicionado aos meus favorito, valeu Douglas