php模板源代码带数据库

// config.php
define('DB_HOST', 'localhost');
define('DB_USER', 'username');
define('DB_PASS', 'password');
define('DB_NAME', 'database_name');

// index.php
require 'config.php';
$conn = new mysqli(DB_HOST, DB_USER, DB_PASS, DB_NAME);

// .env
DB_HOST=localhost
DB_USER=username
DB_PASS=password
DB_NAME=database_name

// index.php
require 'vendor/autoload.php';
$dotenv = Dotenv\Dotenv::createImmutable(__DIR__);
$dotenv->load();

$conn = new mysqli(getenv('DB_HOST'), getenv('DB_USER'), getenv('DB_PASS'), getenv('DB_NAME'));

// config/database.php
'mysql' => [
    'host' => env('DB_HOST', 'localhost'),
    'username' => env('DB_USER', 'forge'),
    'password' => env('DB_PASS', ''),
    'database' => env('DB_NAME', 'forge'),
],

// .env
DB_HOST=localhost
DB_USER=username
DB_PASS=password
DB_NAME=database_name