<?php

$db = "mysql:host=localhost;dbname=huiswerk6b;port=3307";
$user = "root";
$pass = "usbw";
$pdo = new PDO($db, $user, $pass);
$stmt = $pdo->prepare("SELECT * FROM telefoonboek");
$stmt->execute();
while ($row = $stmt->fetch()) {
    $nummer = $row["telefoonnummer"];
    print($nummer . "<br>");
}
$pdo = NULL;
?>