Useful links for PHP

Below are some useful links for PHP : 

Introduction to PHP

http://www.php.net/tut.php 

Starting with PHP

http://www.php-learn-it.com/tutorials/starting_with_php_and_ajax.html 

Home website

http://www.php.net 

PHP source codes

http://www.phpsimple.net/ 

PHP tutorials

http://www.goodphptutorials.com/ 

PHP Avanced Tutorials

http://php.about.com/od/advancedphp/Advanced_PHP.htm