<?php

$host = '127.0.0.1';
$db   = 'test';
$user = 'root';
$pass = '';
$charset = 'utf8mb4';

$dsn = "mysql:host=$host;dbname=$db;charset=$charset";
$pdo = new PDO($dsn, $user, $pass, $opt);
$stmt = $pdo->query('SELECT name FROM users');
while ($row = $stmt->fetch()) {
    echo $row['name'] . "\n";
}