PHP PDO update statement fails - php

Question

The below sql UPDATE statement returns an error but I'm unable to see why:
Failed to run query: SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 6
I already did a vardump of the array that I pass to bind the parameters but I see nothing unusual. The correct values are passed and I double checked for typos.
What I try to accomplish is to auto-generate a username based on firstname - lastname and user_id after insertion into the database.
Perhaps additional question: do you see any harm in that and if so, what is your suggestion?
I'm still in PHP learning phase.
Thanks.
...
//Autogenerate user_name based on first name, last name and user_id (auto-increment)
$query_username = "
UPDATE user_tbl
SET
user_name = :username
WHERE
user_id = :userid
)
";
// The parameter values
$query_params_username = array(
':username' => $_SESSION['user']['first_name'].".".$_SESSION['user']['last_name'].$_SESSION['user']['user_id'],
':userid' => $_SESSION['user']['user_id']
);
try
{
// Execute the query against the database
$stmt_username = $db->prepare($query_username);
$stmt_username->execute($query_params_username);
}
catch(PDOException $ex)
{
//Not to be used in production
die("Failed to run query: " . $ex->getMessage());
}
$_SESSION['user']['username'] = $_SESSION['user']['first_name'].".".$_SESSION['user']['last_name'].$_SESSION['user']['user_id'];

Answer 1

You had a closing parentheses after user_id = :userid
Try the following:
$query_username = "
UPDATE user_tbl
SET
user_name = :username
WHERE
user_id = :userid
";

Answer 2

Try doing this:
$query_username = "
UPDATE `user_tbl`
SET `user_name` = :username
WHERE `user_id` = :userid
";
There seems to be a lost ) character in your code.