PHP 5 Power Programming

5.6. Cookies

The simple registration we used earlier in this chapter does not make data persistent across requests. If you go to the next page (such as by clicking a link or by entering a different URL in your browser's address bar), the posted data is gone. One simple way to maintain data between the different pages in a web application is with cookies. Cookies are sent by PHP through the web server with the setcookie() function and are stored in the browser. If a time-out is set for the cookie, the browser will even remember the cookie when you reset your computer; without the time-out set, the browser forgets the cookie as soon as the browser closes. You can also set a cookie to be valid only for a specific subdomain, rather than having the ...