PHP and MySQL Web Development 4th Ed-tqw-_darksiderg

Implementing Administrative Functions
721
Listing 30.13 Continued
echo "Your old password is incorrect.";
}
}
return false; // old password was wrong
This function is similar to other password setting and changing functions we have looked
at. It compares the two new passwords entered by the user to make sure they are the
same and, if they are, tries to update the user’s password in the database.
Logging Out
When a user clicks on the Log Out button, the log-out action is triggered.The code
executed by this action in the main script is actually in the preprocessing section of the
script, as follows:
if($action == 'log-out') {
unset($action);
$_SESSION=array();
session_destroy();
}
This snippet of code disposes of the session variables and destroys the session. Notice that
it also unsets the action variable; this means that you enter the main case statement
without an action, triggering the following code:
default:
if(!check_logged_in()) {
display_login_form($action);
}
break;
This code allows another user to log in or allows the user to log in as someone else.
Implementing Administrative Functions
If someone logs in as an administrator, she will get some additional menu options, which
can be seen in Figure 30.10.
The extra options are Create List (create a new mailing list), Create Mail (create a
new newsletter), and View Mail (view and send created newsletters that have not yet
been sent). Now let’s look at each of these options in turn.