PDO UPDATE query does not update table - php

Question

The code in question is like this:
if (isset($_SESSION['logged_in'])) {
if (isset($_POST['title'], $_POST['content'], $_POST['id'])) {
$title = $_POST['title'];
$content = $_POST['content'];
$id = $_POST['id'];
}
if (empty($title) or empty($content) or empty($id)) {
$error = 'All fields are required!';
} else {
try {
$query = $pdo->prepare("UPDATE articles SET article_title = ?, article_content = ? WHERE article_id = ? ");
$query->bindValue(1, 'title');
$query->bindValue(2, 'content');
$query->bindValue(3, 'id');
$query->execute();
header('Location: index.php');
} catch (PDOException $e) {
print_r($e->errorInfo);
die();
}
}
}
It gives me no error whatsoever and the table does not update.
P.S. I am quite new to PHP in general so please bear with me if my errors are somewhat trivial, I just don't have anyone else to ask.

Answer 1

If you are new to PHP then I would suggest you try an alternative way of executing queries with placeholders (?) since it is much simpler.
First set up your connection.
try {
# First let us connect to our database
$db = new \PDO("mysql:host=localhost;dbname=xx;charset=utf8", "xx", "xx", []);
} catch(\PDOException $e){
echo "Error connecting to mysql: ". $e->getMessage();
}
$db->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );
Now call prepare/execute methods like:
$stmt = $db->prepare("
UPDATE articles
SET article_title = ?, article_content = ?
WHERE article_id = ?
");
$stmt->execute(array($article_title, $article_content,$article_id));
if($stmt->rowCount()) {
echo 'success';
} else {
echo 'update failed';
}

Answer 2

$query->bindValue(1, 'title');
$query->bindValue(2, 'content');
$query->bindValue(3, 'id');
The second value to bindValue should be the value, not the name of the value, something like;
$query->bindValue(1, $title);
$query->bindValue(2, $content);
$query->bindValue(3, $id, PDO::PARAM_INT);