Main ideas about PHP:

• files are placed in htdocs
• files have extension .php
• ln -s one.php one.phps is used to post the source code
• data comes in the same CGI format: name1=value1&name2=value2
• PHP automatically creates $name1, $name2 with values "value1", "value2"
• code is marked with <? ... ?> tags (scriptlets)
• <?=...?> is used to print the value of an expression
• keep state just like before, in hidden fields
• the template developed for homework two remains unchanged
• basic PHP code syntax is more similar to Perl, but also a bit to Python

To keep state on the server side:

• the code starts with <? session_start(); ?>
• replace hidden fields storing state data with calls to session_register("...")
• each such call creates a variable $name directly linked to the session state variable

In class we will work examples to clarify these principles.

Code developed will be printed here after class.