This chapter talks about making a web application remember who you are by using sessions and cookies.
setcookie() - this PHP code is used to set a cookie on the browser, you can provided a expiration date also in this code
$_cookie - array to store cookies
SHA (value) - encryption code to make data unrecognizable within database
session_start() - PHP code to start a new session
session_destroy () - this closes a session
$_session - array with each session data
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