isdowndetectordown/core/connection.php

<?php
// core/connection.php
declare(strict_types=1);

require __DIR__ . '/vendor/autoload.php';

use Dotenv\Dotenv;

// Load .env from project root
$dotenv = Dotenv::createImmutable(dirname(__DIR__));
$dotenv->load();

date_default_timezone_set('Asia/Kolkata');

function env(string $key, ?string $default = null): ?string
{
    return $_ENV[$key] ?? $_SERVER[$key] ?? $default;
}

$debug = filter_var(env('APP_DEBUG', 'false'), FILTER_VALIDATE_BOOLEAN);

ini_set('display_errors', $debug ? '1' : '0');
ini_set('display_startup_errors', $debug ? '1' : '0');
error_reporting(
    $debug ? E_ALL : (E_ALL & ~E_NOTICE & ~E_DEPRECATED & ~E_STRICT)
);

try {
    $pdo = new PDO(
        sprintf(
            'mysql:host=%s;dbname=%s;charset=utf8mb4',
            env('DB_HOST', '127.0.0.1'),
            env('DB_NAME', 'isdowndetectordown')
        ),
        env('DB_USER', 'root'),
        env('DB_PASS', ''),
        [
            PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
            PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
            PDO::ATTR_EMULATE_PREPARES   => false,
        ]
    );
} catch (PDOException $e) {
    http_response_code(500);
    echo 'DB connection failed';
    if ($debug) {
        echo ': ' . htmlspecialchars($e->getMessage(), ENT_QUOTES, 'UTF-8');
    }
    exit;
}

function db(): PDO
{
    global $pdo;
    return $pdo;
}