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

678 Chapter 29 Building a Web-Based Email Service
display_message($_SESSION['auth_user'],
$_SESSION['selected_account'],
$messageid, $fullheaders);
break;
Here, you check the value of the $action being equal to ‘show-headers’. In this case,
it is false, and $fullheaders is set equal to false.We look at the ‘show-headers’
action in a moment.
The line
$fullheaders = ($action == 'show-headers');
could have been more verbosely—but perhaps more clearly—written as
if ($action == 'show-headers') {
$fullheaders = true;
} else {
$fullheaders = false;
}
Next, you call the display_message() function. Most of this function outputs plain
HTML, so we do not go through it here. It calls the retrieve_message() function to
get the appropriate message from the mailbox:
$message = retrieve_message($auth_user, $accountid, $messageid, $fullheaders);
The retrieve_message() function is in the mail_fns.php library.You can see the code
for it in Listing 29.10.
Listing 29.10 retrieve_message() Function from mail_fns.php—This Function
Retrieves One Specific Message from a Mailbox
function retrieve_message($auth_user, $accountid, $messageid,
$fullheaders) {
$message = array();
if(!($auth_user && $messageid && $accountid)) {
return false;
}
$imap = open_mailbox($auth_user, $accountid);
if(!$imap) {
return false;
}
$header = imap_header($imap, $messageid);
if(!$header) {
return false;
}