# Upgrade from 3.x to 4.x

1. Namespace for functions

   Add to beginning of *deploy.php* next line:
    
   ```php
   use function Deployer\{server, task, run, set, get, add};
   ```
   
   If you are using PHP version less than 5.6, you can use this:
   
   ```php
   namespace Deployer;
   ```

2. `env()` to `set()`/`get()`
   
   Rename all calls `env($name, $value)` to `set($name, $value)`.
   
   Rename all rvalue `env($name)` to `get($name)`.
    
   Rename all `server(...)->env(...)` to `server(...)->set(...)`.

3. Moved *NonFatalException*
   
   Rename `Deployer\Task\NonFatalException` to `Deployer\Exception\NonFatalException`.

4. Prior release cleanup
   
   Due to changes in release management, the new cleanup task will ignore any prior releases deployed with 3.x.  These will need to be manually removed after migrating to and successfully releasing via 4.x.

# Upgrade from 2.x to 3.x

1. ### `->path('...')`   

   Replace your server paths configuration:
   
   ```php
   server(...)
     ->path(...);
   ```
   
   to:
   
   ```php 
   server(...)
     ->env('deploy_path', '...');
   ```