PHP Select with PDO Call to a member function prepare() on a non-object error

PHP Select with PDO Call to a member function prepare() on a non-object error

I'm getting a Call to a member function prepare() on a non-object error in
my PHP when using PDO to select data that was sent via an AJAX call.
Searching around on StackOverflow I've found many answers to this error,
but none work to fix my problem.
The weird part is that the other PHP files use the same PDO calls and work
successfully, but this one is giving me the non-object error only.
To note, the PDO connection is identical to the other pages where it
works, so I know that's not causing the problem.
Also, I have tested that the AJAX data sent is being received, and that is
working too.
PHP Code header('Content-Type: application/json'); $mysql_user =
"NotTelling"; $mysql_password = "DefinatelyNotThis"; try { $dbh = new
PDO("mysql:host=somehost;dbname=somename", $mysql_user, $mysql_password);
$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$username = $_POST['username'];
$inPword = $_POST['password'];
$lat = $_POST['lat'];
$lon = $_POST['lon'];
$loggedin = "";
$password_hash = "";
$loggedinstatus = "";
$pts = "";
function getLoginInfo()
{
$sth = $dbh -> prepare('SELECT pword, loggedin, points FROM login
WHERE uname = :uname');
$sth->bindParam(':uname', $username, PDO::PARAM_STR);
while($row = $sth->fetch(PDO::FETCH_ASSOC))
{
echo $row['pword'];
echo $row['loggedin'];
echo $row['points'];
}
$password_hash = $fetch['pword'];
$loggedinstatus = $fetch['loggedin'];
$pts = $fetch["points"];
if($password_hash === null || $loggedinstatus === null || $pts ===
null)
{
die(json_encode(array("message" => "none")));
}
else
{
return "more";
}
}
function checkLoginCreds()
{
if(crypt($inPword, $password_hash) === $password_hash)
{
switch($loggedinstatus)
{
case "no":
$sel = $dbh->prepare("UPDATE login SET loggedin='yes'
WHERE uname = ?");
$sel->execute(array($username));
return "AllGood";
break;
defaut:
return "alreadyin";
break;
}
}
else
{
return "BadLogin";
}
}
if(getLoginInfo() === "more")
{
echo json_encode(array("message" => checkLoginCreds()));
}
getLoginInfo();
}
catch(PDOException $e)
{
echo $e->getMessage();
file_put_contents('PDOErrors.txt', $e->getMessage(), FILE_APPEND);
}
Finally, here's the output when I var_dump() the PDO connection.
object(PDO)#1 (0) {}