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

668 Chapter 29 Building a Web-Based Email Service
The function that retrieves any existing accounts is get_accounts(), from the
mail_fns.php library.This function is shown in Listing 29.4.
Listing 29.4 get_accounts() Function from mail_fns.php—Function to Retrieve
All the Account Details for a Particular User
function get_accounts($auth_user) {
$list = array();
if($conn=db_connect()) {
$query = "select * from accounts where username = '".$auth_user."'";
$result = $conn->query($query);
if($result) {
while($settings = $result->fetch_assoc()) {
array_push($list, $settings);
}
} else {
return false;
}
}
return $list;
}
As you can see, the get_accounts() function connects to the database, retrieves all the
accounts for a particular user, and returns them as an array.
Creating a New Account
If a user fills out the account form and clicks the Save Changes button, the storesettings
action will be activated. Let’s look at the event handling code for this from
index.php. In the preprocessing stage, you execute the following code:
case 'store-settings':
store_account_settings($_SESSION['auth_user'], $_POST);
break;
The store_account_settings() function writes the new account details into the database.The
code for this function is shown in Listing 29.5.
Listing 29.5 store_account_settings() Function from mail_fns.php—
Function to Save New Account Details for a User
function store_account_settings($auth_user, $settings) {
if(!filled_out($settings)) {
echo "All fields must be filled in. Try again.";
return false;
} else {
if($settings['account']>0) {