Sessions Class (stored in table) not updating as expected - php

Question

OK, I'm fully expecting someone to come along and tell me I missed something obvious, but I've spent days trying to figure out what's wrong, and I at this point, if someone can point out a stupid mistake, I'll just be glad to solve the problem. I'm just starting to figure out PDO, so I'm guessing the problem is there, but I really don't know.
This is mostly working. It opens, closes, reads, and does garbage collection. It will write, but only the id, not the data. Destroy is not working either, which seems to be related. If I put echo into the functions, the variables are being passed. The queries work when I try them directly. What seems to be happening is that the binding isn't working. I've tried both bindParam and bindValue. I've tried so many other things I can't even list them all. So anyway, here's the class:
class Sessions {
private $id;
private $data;
protected $pdo;
private $maxTime;
public function __construct(PDO $pdo) {
$this->pdo = $pdo;
// Set handler to overide SESSION
#session_set_save_handler(
array($this, "openSession"),
array($this, "closeSession"),
array($this, "readSession"),
array($this, "writeSession"),
array($this, "destroySession"),
array($this, "gcSession")
);
session_start();
}
public function openSession()
{
// If successful
if ($this->pdo) {
return true;
} else {
return false;
}
}
public function closeSession() {
// Close the database connection
if ($pdo = NULL) {
#session_write_close();
return true;
} else {
return false;
}
}
public function readSession($id) {
if (isset($id)) {
// Set query
$q = 'SELECT data FROM sessions WHERE id = :id';
$stmt = $this->pdo -> prepare($q);
// Bind the Id
$stmt -> bindValue(':id', $id);
$stmt -> execute();
$r = $stmt -> fetch();
// Return the data
if (!empty($r['data'])) {
return $r['data'];
} else {
// Return an empty string
return '';
}
} else {
return '';
}
}
// when session started and updated
public function writeSession($id, $data) {
// Set query
$q = "INSERT INTO sessions
(id, `data`, startTime)
VALUES (:id, :data, NOW())
ON DUPLICATE KEY UPDATE
`data` = :data2,
startTime = NOW()";
$stmt = $this->pdo->prepare($q);
// Bind data
$stmt->bindParam(':id', $id);
$stmt->bindParam(':data', $data);
$stmt->bindParam(':data2', $data);
$stmt->execute();
if ($stmt->rowCount()) {
return TRUE;
} else {
return FALSE;
}
}// when session started and updated
public function writeSession($id, $data) {
// Set query
$q = "INSERT INTO sessions (id, `data`, startTime) VALUES (:id, :data, NOW()) ON DUPLICATE KEY UPDATE `data` = :data2, startTime = NOW()";
$stmt = $this->pdo -> prepare($q);
// Bind data
$stmt->bindParam(':id', $id);
$stmt->bindParam(':data', $data);
$stmt->bindParam(':data2', $data);
$stmt->execute();
if ($stmt->rowCount()) {
return TRUE;
} else {
return FALSE;
}
}
public function destroySession($id) {
echo $id;
$q = "DELETE FROM `sessions` WHERE `id`= :id";
$stmt = $this->pdo -> prepare($q);
$stmt->execute(array(':id' => $id));
// Attempt execution
if ($stmt === true) {
echo " worked ";
return TRUE;
} else {
echo " no ";
return FALSE;
}
}
public function gcSession($maxTime) {
$q="DELETE FROM sessions WHERE (NOW()-startTime > $maxTime)";
$stmt = $this->pdo -> prepare($q);
if ($stmt->execute()) {
return TRUE;
} else {
return FALSE;
}
}
}
The function is being called this way:
// Store the user in the session and redirect:
$startSessions = new Sessions($pdo);
$_SESSION['data'] = 'IDnotOK';
$startSessions -> writeSession(session_id(), 'IDallOK');
$startSessions -> gcSession(1800);
The 'IDnotOK' is being sent to the database (sort of - it's 'data|s:7:"IDnotOK";'), instead of 'IDallOK'. If the $_SESSION['data'] isn't there, nothing is sent at all. The id is passed just fine. The timestamp also updates just fine. When I call:
$startSessions -> destroySession(session_id());
it doesn't matter how I try to pass the id, it will echo from within the function, but won't do anything to the database entry. Garbage collections works (probably because it only relies on the time and doesn't care about the id).
I wish I could list everything I've tried, but I've lost track. If there are any other questions that will help track down the problem, please ask. Thank You!