<?php
// Docker-only replacement for includes/conn.php; local/server config is untouched.
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
foreach (['MYSQL_HOST', 'MYSQL_DATABASE', 'MYSQL_USER', 'MYSQL_PASSWORD'] as $key) {
    if (getenv($key) === false || getenv($key) === '') {
        throw new RuntimeException('Missing database environment variable: ' . $key);
    }
}
$conn = new mysqli(
    getenv('MYSQL_HOST'),
    getenv('MYSQL_USER'),
    getenv('MYSQL_PASSWORD'),
    getenv('MYSQL_DATABASE'),
    (int) (getenv('MYSQL_PORT') ?: 3306)
);
$conn->set_charset('utf8mb4');