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Figure 12-15 That s it for the user portion of the registration system. You ll create an administration section later in the chapter, where you can allow certain levels of admins to have different privileges from others. But now, let s move on to a quick cookie example, which you can implement into the previous registration system. Using Cookies in PHP Cookies are used much like sessions, as explained previously. The main difference between sessions and cookies is you can control the amount of time the cookie is available for, unlike sessions, which disappear when users close their browser. Cookies are used to store information about a user s logins, preferences, or anything else you want to store there that you want to retrieve when a user revisits your site. 399 User Logins, Profiles, and Personalization
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Figure 12-14 Finally, the delete page looks similar to the one shown in Figure 12-15. This appears once users choose the Delete Account link on the display page. From here, if users choose Yes, their account is deleted, their logged-in session will be destroyed, and they will be redirected to the index page. 398 Chapter 12
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Figure 12-13 Should they update their information, users will be told that the information was indeed updated and they will be allowed to update the information again if they wish (for example, if on review they realize they input something incorrectly). That page will look like the one in Figure 12-14. 397 User Logins, Profiles, and Personalization
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Figure 12-12 When users choose to update their accounts, they will see a screen similar to Figure 12-13. 396 Chapter 12
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Figure 12-11 Now the logged-in users are able to navigate to their own personal information pages where they can update their information at any time and are also allowed to delete their account from this location. The beauty of sessions and keeping track of users is that you don t have to worry about passing information about the users with form data, or passing it through the query string or address bar. All the data is stored temporarily on the server where the Web site resides. You also don t have to worry about people trying to put parameters into the address bar to fake the identity of another user. The session data is unavailable to users on the site, so only if they had access to the server itself would they be able to obtain the user-supplied data. Now you will look at the pages where the user s information is displayed, and where a user can update or delete his or her account. The display page simply displays the previously entered user information. The update page is also straightforward: It shows a form with the user s previously entered data and gives the user the ability to update it if he or she wishes or simply cancel the update and return to the previous screen. The delete page merely asks if the user is sure he or she wants to delete the account and gives the option of returning to the previous screen. The user s information display page should look something like the one shown in Figure 12-12. 395 User Logins, Profiles, and Personalization
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Figure 12-10 Now users can choose another username and complete the registration process. Once the user chooses a username that is not already taken, the registration is complete. Once the registration is complete, the user is automatically logged in for this session using the username and password as the session values, and he or she will be redirected to the home page. After being redirected, the user s screen should look similar to Figure 12-11. 394 Chapter 12
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Figure 12-9 Users can now fill in the missing information and continue. A check is performed after the required fields are satisfied to see if the username chosen is already taken. Should that be the case, the form again retains any information that has been filled out, and a different error message appears on the screen stating that the username is taken. The username field is erased so users know that they need to choose another username. The screen will look like that in Figure 12-10. 393 User Logins, Profiles, and Personalization
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Figure 12-8 Now users can fill in their information and register to be a user of this site. Once the user fills in the information and hits the register button, the code checks whether or not the required fields have been filled out. If one (or more) of the required fields is not filled out, the form appears again with the information entered still in the form and an error message stating the problem. The page will look similar to the one shown in Figure 12-9. 392 Chapter 12
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Figure 12-7 Users will be required to supply the usernames and passwords they chose for themselves. The only difference between this login page and the previous one you created is that the authorization is coming from a MySQL database, rather than hard coding of the authorization into the pages themselves. If users don t enter the information correctly, they will be asked for the information again, and have the option to register from that page as well. If a user chooses to register, he or she will see a page similar to the one in Figure 12-8. 391 User Logins, Profiles, and Personalization
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Figure 12-6 The users obviously haven t logged in yet, so they are not allowed to do anything else here. They are given the choice to log in if they have registered before, or they can register to activate an account. Should the users decide to log in, they will be presented with the same options as when you created the previous login pages. The page should look like the one in Figure 12-7. 390 Chapter 12
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