problem with select statement mysql - php

Question

This has annoyed me for a while now. I am trying this query in phpmyadmin.
select `id` from `users` where `fb_id` = 507292797 limit 1
This returns the value 13, so why doesn't this work:
$sql = "select `id` from `users` " .
"where `fb_id` = :fb_id " .
"limit 1";
try
{
$stmt = $this->db->prepare($sql);
$stmt->bindParam(':fb_id', $fb_id2, PDO::PARAM_INT);
$user = $stmt->fetch(PDO::FETCH_ASSOC);
$result = $stmt->execute();
$stmt->closeCursor();
}
catch (Exception $e)
{
die ($e->getMessage() );
}
echo "id: " . $fb_id2 . " var_dump: " . var_dump($user);
exit();
This returns:
id: 507292797 var_dump: bool(false)
When var_dump should return $user['id'] = 13
Can somebody see what I am doing wrong here?
ps. here is my db connection function if that matter
$dsn = "mysql:host=" . DB_HOST . ";dbname=" . DB_NAME;
$driver_options = array( PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES UTF8' );
try
{
$this->db = new PDO($dsn, DB_USER, DB_PASS, $driver_options);

Answer 1

You are doing things in this order :
Preparing the statement
Binding the variables
Trying to fetch data from the statement
Executing the statement
The two last steps should be in the inverse order : you must execute the statement before you can fetch data (that's obtained by executing it).
Basically, instead of using this :
// fetch, then execute ???
$user = $stmt->fetch(PDO::FETCH_ASSOC);
$result = $stmt->execute();
You should use that :
// Execute, **then** fetch
$stmt->execute();
$user = $stmt->fetch(PDO::FETCH_ASSOC);

Answer 2

Looks like you are fetching before executing?