<?php
$host = "localhost";
$db   = "testdb";
$user = "root";
$pass = "";
$charset = "utf8mb4";

$dsn = "mysql:host=$host;dbname=$db;charset=$charset";
$options = [
    PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
    PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
];

try {
    $pdo = new PDO($dsn, $user, $pass, $options);
} catch (PDOException $e) {
    die("Connection failed: " . $e->getMessage());
}

$stmt = $pdo->query("SELECT * FROM users");

foreach ($stmt as $row) {
    echo $row['id'] . " - " . $row['name'] . " - " . $row['email'] . "<br>";
}