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---
layout: documentation
current_menu: environments
---
# Injections depending on the environment
You may want to inject different parameters or objects according to the environment, for example:
```php
<?php
return [
// These values change according to the environment
'db.host' => 'localhost',
'db.port' => 3336,
'DbAdapter' => DI\create()
->constructor(DI\get('db.host'), DI\get('db.port')),
];
```
To achieve this, you can create a main `config.php` file and have small configuration files for each environment:
```php
<?php
// config.prod.php
return [
'db.host' => '178.231.21.29',
'db.port' => 5000,
];
```
```php
<?php
// config.dev.php
return [
'db.host' => 'localhost',
'db.port' => 3336,
];
```
```php
<?php
// config.php
return [
'DbAdapter' => DI\create()
->constructor(DI\get('db.host'), DI\get('db.port')),
];
```
Then you can configure your container to including the correct files:
```php
$builder = new ContainerBuilder();
// Main configuration
$builder->addDefinitions("config.php");
// Config file for the environment
$builder->addDefinitions("config.$environment.php");
$container = $builder->build();
```
## Compilation
If you configure PHP-DI to be compiled you need to compile each environment into a separate file to avoid mixups.
Read the [Performances](performances.md) documentation to learn about compiling the container.
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