انتخاب داده ها با استفاده از PDO

<?php
echo "<table style='border: solid 1px black;'>";
echo "<tr><th>Id</th><th>Firstname</th><th>Lastname</th></tr>";

class TableRows extends RecursiveIteratorIterator { 
function __construct($it) { 
parent::__construct($it, self::LEAVES_ONLY); 
}

function current() {
return "<td style='width:150px;border:1px solid black;'>" . parent::current(). "</td>";
}

function beginChildren() { 
echo "<tr>"; 
} 

function endChildren() { 
echo "</tr>" . "\n";
} 
} 

$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDBPDO";

try {
$conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$stmt = $conn->prepare("SELECT id, firstname, lastname FROM MyGuests"); 
$stmt->execute();

// set the resulting array to associative
$result = $stmt->setFetchMode(PDO::FETCH_ASSOC); 
foreach(new TableRows(new RecursiveArrayIterator($stmt->fetchAll())) as $k=>$v) { 
echo $v;
}
}
catch(PDOException $e) {
echo "Error: " . $e->getMessage();
}
$conn = null;
echo "</table>";
?>

Id	Firstname	Lastname
1	John	Doe
2	Mary	Moe
3	Julie	Dooley