如何从PDO和Mysql查询在html表中插入结果

Question

如何将结果输入到html表中？我似乎无法完成此操作。.下面的结果仅给我表的第一行。其余结果显示在HTML之外。我该怎么办？谢谢

        <?php

     echo "<table style='width:960px;background-color:silver;text-align:center;'>
            <tr>
            <th>Customer ID</th>
            <th>First Name</th>
            <th>Last Name</th>
            <th>Email</th>
            <th>Registration Date</th>
            </tr>";

        require_once("PDOconn.php");
        // DISPLAY THE ENTRY IN A FORM
        //Define query
        try{
        $dsn = "mysql:host=$servername;dbname=$dbname";
        $conn = new PDO($dsn,$username,$password);
        $conn->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_EXCEPTION);



           $stmt = $conn->query('SELECT * FROM `Demo_Guests` ORDER BY reg_date ASC'); 
        while ($row = $stmt->fetch(PDO::FETCH_ASSOC)){

        echo "<tr><td>

        <a href=\"click_link.php?id={$row['id']}\"> id # " . $row['id'] . "</a><br></td>";

        <td>{$row['firstname']} </td>

        <td>{$row['lastname']}</td>

        <td><a href=\"send_email.php?id={$row['email']}\">" . $row['email'] . "</a> 
        </td>

        <td> {$row['reg_date']}</td></tr>";
 echo "</table><br>";*/

        }

        }

        catch(PDOException $e){
        echo $e->getMessage();
        }

        ?>