DevWEB/db.php

<?php
$pdo = new PDO(
    "mysql:host=" . getenv('DB_HOST') .
    ";dbname=" . getenv('DB_NAME') .
    ";charset=utf8mb4",
    getenv('DB_USER'),
    getenv('DB_PASS'),
    [PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION]
);