Codeigniter - 在环境之间切换

使用CodeIgniter框架可以轻松地在不同的环境之间进行切换。CodeIgniter是一个流行的PHP框架，它提供了一种简单而灵活的方法来构建Web应用程序。在本文中，我们将介绍如何使用CodeIgniter来实现环境切换，并提供一个案例代码来帮助你理解。

php
define('ENVIRONMENT', isset($_SERVER['CI_ENV']) ? $_SERVER['CI_ENV'] : 'development');

php
define('ENVIRONMENT', isset($_SERVER['CI_ENV']) ? $_SERVER['CI_ENV'] : 'production');

php
if (defined('ENVIRONMENT'))
{
    switch (ENVIRONMENT)
    {
        case 'development':
            require_once APPPATH . 'config/development.php';
            break;
        case 'testing':
            require_once APPPATH . 'config/testing.php';
            break;
        case 'production':
            require_once APPPATH . 'config/production.php';
            break;
        default:
            exit('The application environment is not set correctly.');
    }
}

php
$config['hostname'] = 'localhost';
$config['username'] = 'dev_user';
$config['password'] = 'dev_password';
$config['database'] = 'dev_database';
$config['dbdriver'] = 'mysqli';

php
$config['hostname'] = 'localhost';
$config['username'] = 'test_user';
$config['password'] = 'test_password';
$config['database'] = 'test_database';
$config['dbdriver'] = 'mysqli';

php
$config['hostname'] = 'localhost';
$config['username'] = 'prod_user';
$config['password'] = 'prod_password';
$config['database'] = 'prod_database';
$config['dbdriver'] = 'mysqli';

php
if (defined('ENVIRONMENT'))
{
    switch (ENVIRONMENT)
    {
        case 'development':
            require_once APPPATH . 'config/development.php';
            break;
        case 'testing':
            require_once APPPATH . 'config/testing.php';
            break;
        case 'production':
            require_once APPPATH . 'config/production.php';
            break;
        default:
            exit('The application environment is not set correctly.');
    }
}