Understanding why cookies are necessary to identify a particular web
browser to a web server.
Setting a cookie in a PHP program.
Reading a cookie value in a PHP program.
Modifying cookie parameters such as expiration time, path, and domain.
Deleting a cookie in a PHP program.
Turning on sessions from a PHP program or in the PHP interpreter
Storing information in a session.
Reading information from a session.
Saving form data in a session.
Removing information from a session.
Configuring session expiration and cleanup.
Displaying, validating, and processing a validation form.
Using encrypted passwords.
Understanding why setcookie( ) and
session_start( ) must be called before anything is