<?php
$host = 'your host';
$db   = 'your dbname';
$user = 'your user';
$pass = 'your password';
$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,
    PDO::ATTR_EMULATE_PREPARES   => false,
];
try {
     $pdo = new PDO($dsn, $user, $pass, $options);
} catch (\PDOException $e) {
     throw new \PDOException($e->getMessage(), (int)$e->getCode());
}

$stmt = $pdo->query('SELECT name FROM users limit 1');
while ($row = $stmt->fetch())
{
    echo $row['name'] . "\n";
}