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

670 Chapter 29 Building a Web-Based Email Service
Modifying an Existing Account
The process for modifying an existing account is similar.The user can change the
account details and click the Save Changes button. Again, this activity triggers the
store-settings action, but this time it updates the account details instead of inserting
them.
Deleting an Account
To delete an account, the user can click the Delete Account button shown under each
account listing. Doing so activates the delete-account action.
In the preprocessing section of the index.php script, you execute the following code:
case 'delete-account':
delete_account($_SESSION['auth_user'], $account);
break;
This code calls the delete_account() function.The code for this function is shown in
Listing 29.6. Account deletion needs to be handled before the header because a choice
of which account to use is located inside the header.The account list needs to be updated
before it can be correctly drawn.
Listing 29.6 delete_account() Function from mail_fns.php—Function to Delete
a Single Account’s Details
function delete_account($auth_user, $accountid) {
//delete one of this user's accounts from the DB
$query = "delete from accounts where accountid = '".$accountid."'
and username = '".$auth_user."'";
if($conn=db_connect()) {
$result = $conn->query($query);
}
return $result;
}
After execution returns to index.php, the body stage runs the following code:
case 'store-settings':
case 'account-setup':
case 'delete-account':
display_account_setup($_SESSION['auth_user']);
break;
Notice that this is the same code you ran before; it just displays the list of the user’s
accounts.