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PHPでMySQLから一つだけデータを取り出す

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<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta name="keywords" content="XXX">
<meta name="description" content="XXX">
<title>XXX</title>
<link rel="stylesheet" href="/main.css">
</head>

<body>
<?php
try {
//DB名、ユーザー名、パスワード
    $dsn = 'mysql:dbname=XXX;host=XXX';
    $user = 'XXX';
    $password = 'XXX';

    $PDO = new PDO($dsn, $user, $password); //MySQLのデータベースに接続
    $PDO->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $result = $PDO->query("SELECT id FROM contents WHERE id = 47329"); //MySQLのid列が47329の行だけを抽出
  while($row = $result->fetch(PDO::FETCH_ASSOC)){
    $rows .= $row['id']."</br>";
  }
} catch (PDOException $e) {
    exit('データベースに接続できませんでした。' . $e->getMessage());
}
?>

<?php echo $rows; ?>

</body>
</html>
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