State: >
Hobbies/Interests: (choose at least one)

>Golfing >Hunting >Reading >Dancing >Internet >Flying >Traveling >Exercising >Computers >Other Than Listed

409 User Logins, Profiles, and Personalization
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} ?>>Reading >Dancing >Internet >Flying >Traveling >Exercising >Computers >Other Than Listed

Update User Information

User information has been updated.
Click here to return to the admin area.
> Username: >
Password: Not displayed
First Name: >
Last Name: >
Email: >
City: >
State: >
Hobbies/Interests: (choose at least one)

>Golfing >Hunting We highly recommend you visit web and email hosting services if you need stable and cheap web hosting platform for your web applications.

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Beginning PHP5, Apache and MySQL Admin Area Below (Net web server)

Friday, January 18th, 2008

Admin Area

Below is a list of users and your available administrator privileges.

   >Update User
   >Update User | >Delete User
8. Create the eighth file, update_user.php: 406 Chapter 12
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?> Beginning PHP5, Apache and MySQL Invalid Username (Web server hosting)

Friday, January 18th, 2008

?>

Invalid Username and/or Password

> Username:
Password:

Login below by supplying your username/password…

7. Create the seventh file and save it as admin_area.php: 405 User Logins, Profiles, and Personalization
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4. Create the fourth file, logged_admin.php:

Welcome to the Admin Area!

You are currently logged in.
Click here to access your administrator tools.

5. Create and save the fifth file as unlogged_admin.php:

Welcome to the Admin Area!

You are currently not logged in.
Once logged in, you will have access to your administrator tools.
Click here to login.

6. Create the sixth file, admin_login.php: ; echo (If your browser doesn t support this, . click here) ; } else { 404 Chapter 12
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and delete user accounts. Admins with a privilege level of 2 are allowed to update user information, but they will not be allowed to delete a user s account. This would be useful if a user was, for some reason, unable to log in to the site and the administrator needed to reset passwords, change usernames, and so on, but you don t want just any administrator to be allowed to do everything the main administrator does. Try It Out Administration Section The code for all the pages follows. Key the pages in, and save them in a folder called admin in your Web directory. We will explain how they work in a bit. 1. Create the first file, conn.inc.php: 2. Create the second file, auth_admin.inc.php: ; echo (If your browser doesn t support this, . click here) ; die(); } ?> 3. Create the third file and save it as index.php: 403 User Logins, Profiles, and Personalization
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Figure 12-16 Now that you have some cookie knowledge, you can use it in the login system if you want. Although cookies are a good way to keep persistent logins between browser sessions, they can be altered or spoofed by a user because the cookie is stored on the client machine. That is generally why many systems house their main login information with sessions and use cookies as a subfeature only. Administrator Registration In this last portion of this chapter, you learn how logged-in admins can change information and delete information based on their access privileges. You may notice similarities between this system and the user login system, and you d be right. Remember that the more you practice, the easier this will be when you are writing systems like this for your clients. In this section, administrators are required to log in before they can view the users signed up in the user registration database. Once they are logged in, only certain privileged admins will be allowed to perform certain operations. For this example, admins with a privilege level of 1 are allowed to update user accounts 402 Chapter 12
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5. Finally, create the fifth file, testcookie.php:

This is the Test Cookie Page

No cookie was set.
Click here to set your cookie. Your cookies were set:
Username cookie value:
Password cookie value:

How It Works We ran through this cookie example to show you how you can keep persistent logins between single browser sessions. As you may have noticed, some of the pages are just display or navigation pages. For that reason, we won t explain those. We will focus instead on setcookie_un.php, setcookie_pw.php, and testcookie.php. The setcookie_un.php page does just what the name says: It sets the cookie for the username, which is just hard-coded for this example. It then uses a header redirect to send you to the next page. That next page is setcookie_pw.php, which does the same as setcookie_un.php, except that it is setting the cookie for the password. Then you re redirected to a simple display page that tells you your cookies have been set. You can then navigate to testcookie.php. This page checks to see if the cookie values are valid. If they are not, it says No cookies were set, and you can try to set the cookies again. If you are successful in your login, the screen will look like the one in Figure 12-16. If you need to delete or end a cookie, simply run some code (such as the code that follows) to end the cookie from the user s browser. setcookie( username , , time() - 3600); This sets the username cookie for one hour ago and sets the username value to an empty string, thereby making the username cookie unavailable to the Web site the user is logged into. 401 User Logins, Profiles, and Personalization
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Try It Out Cookie Tracking with PHP Here s a quick example of how to use a cookie in a page to see if the users have a corresponding cookie stored on their machines. Then, if you want, you can implement this into your login system to allow persistent logins between single browser sessions. You will be supplying the cookie s value through the code, but if you were to implement it, you could replace all the code you ve done so far with cookies rather than sessions. You ll use five small pages for this example. We will give you all of them and then explain how they work. 1. Create the first file, setcookie.php:

This is the Set Cookie Page

Click here to set your cookies.

2. Create the second file, setcookie_un.php: 3. Create the third file, setcookie_pw.php: 4. Create the fourth file, cookies_set.php:

This is the Set Cookie Page

Your cookies have been set.
Click here to test your cookies.

400 Chapter 12
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