I haven't read the book so I can't comment on it. But as for getting your information from post or get methods it is simplicity in itself for PHP. PHP creates variables for every element passed via get or post, so if you have a form with a text field named text1 when you post/get that form to the PHP page you will have a variable named $text1.
PHP also stores all post and get variables into separate arrays. $HTTP_POST_VARS and $HTTP_GET_VARS.