Login test error

<?php
$id = $_GET['id'];
$id = str_replace(' ', '', $id);
if (!preg_match('/^\d+$/m', $id)) {
    die('Lucifear!!!');
}
$id = preg_replace('/^[^\d]+$/', '', $id);

$query = "SELECT * FROM `users` WHERE `id`=({$id})";
$db = new PDO('mysql:dbname=pentest;host=127.0.0.1', 'pentest', '***');
if (!$result = $db->query($query)) {
die('Lucifear!!');
}
$records = $result->fetchAll(PDO::FETCH_OBJ);

foreach ($records as $record): ?>
<strong>Username:</strong> <?=$record->user?><br />
<strong>Passname:</strong> <?=$record->pass?>
<hr>
<?php endforeach; ?>