<?php
$host = getenv('DB_HOST');
$port = getenv('DB_PORT') ?: '3306';
$db   = getenv('DB_DATABASE');
$user = getenv('DB_USERNAME');
$pass = getenv('DB_PASSWORD');

$pdo = new PDO(
    "mysql:host={$host};port={$port};dbname={$db};charset=utf8mb4",
    $user,
    $pass
);
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$pdo->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC);