Composer simplifies and unifies the code distribution in PHP, there is not much difference, but Bundles for Laravel 3 are mostly not compatible with Laravel 4.
By Composer, each package you want to install is a dependency of the project, so by editing the Composer.json file, you should add the package in question in the require section, to search for packages, you can use packagist.org
For example, there is a Laravel 4 Generator Pack made by Jeffrey Way, if I want to use it in the project, I should add the package to Composer.json, in the require session
"require": {
"laravel/framework": "4.0.*",
"way/generators": "dev-master"
},
The Line "laravel/framework": "4.0.*"
already existed, added the line "way/generators": "dev-master"
This still does nothing in the project, for the library to be downloaded, run at the root of the project the command:
php composer.phar update
Or if Composer is installed Globally in your environment
composer update
Once this is done, the package source will be available in the vendor folder, and will be automatically loaded by Composer autoloader, no need to include or require.
Each package can be used separately, or as in the case of the "Generators" package in the example, it integrates with Laravel 4, simply add this line:
'Way\Generators\GeneratorsServiceProvider'
app/config/app.php in the providers session.
Before trying to understand the Packages for Laravel 4, try to study a little more Composer, is a phenomenal and indispensable tool for PHP programmers.
I hope I was clear.
That was exactly the use I was not understanding, about the Poser already know some things of it, the problem was in the same places, thank you very much
– Thiago Bueno
Consider reading the documentation for Each Package, virtually all packages for Laravel 4 have installation instructions
– hernandev