Global variable not available in function

I’m very new to PHP programming, so excuse me for asking this (most likely) dumb question.
I’ve added a new page to my WordPress by creating a template. This template contains code for retrieving the logged-in user’s ID and name. This information needs to be emailed.

So in the WP template I have this;


// retreive information about this user
GLOBAL $fb_currentUserID;
GLOBAL $fb_currentName;

$fb_currentUserID = get_current_user_id();
echo ($fb_currentUserID);

$fb_currentNameQuery = mysql_query("SELECT user_nicename FROM wp_users WHERE ID = “.$fb_currentUserID.””);
$fb_currentNameArray = mysql_fetch_array($fb_currentNameQuery);
$fb_currentName = $fb_currentNameArray[‘user_nicename’];
echo ($fb_currentName);

These echo’s ($fb_currentName and $fb_currentUserID) show up just fine. But when I use them in this function (a little further down in the code), nothing is displayed.


function mailInvitation($email, $pass) {
$subject = "You're invited by".$fb_currentName."";
echo ($subject);
$body = "Hi,\n\nTo register your account, please surf to http://localhost/invite?pass=".$pass."";
if (mail($email, $subject, $body)) {
echo("<p>Message successfully sent!</p>");
} else {
echo("<p>Message delivery failed...</p>");
}
}


Here the $subject only shows ‘You’re invited by’. It doesn’t want to print the $fb_currentName even though I thought to have it setup as a global variable.

Can anyone tell me what I’m doing wrong?