Loading third party library: not found - php

Question

I am trying to include a third party library into my Symfony 2 project as explained here. However, I keep getting the error message Fatal error: Class 'Sprain_Images' not found in /src/MyProject/MyBundle/Controller/BackendController.php on line 267.
Here is what I did:
I put a third party class into the src folder (not directly in vendors because this class is not available to be loaded by deps).
#Directory structure
-src
-MyProject
-vendor
-sprain
-lib
-Images
-src
Images.php
Then I created the class to be used:
# /src/vendor/sprain/lib/Images/Images.php
require_once __DIR__.'/src/class.Images.php';
class Sprain_Images extends Images {
}
I also registered the prefix in autoload.php:
# /app/autoload.php
$loader->registerPrefixes(array(
'Twig_Extensions_' => __DIR__.'/../vendor/twig-extensions/lib',
'Twig_' => __DIR__.'/../vendor/twig/lib',
'Sprain_' => __DIR__.'/../src/vendor/sprain/lib',
));
And eventually I called the class in my controller:
# /src/MyProject/MyBundle/Controller/BackendController.php
$image = new \Sprain_Images();
However the class is not being found. Where did I make the mistake?

Answer 1

The class Sprain_Images should be in src/vendor/sprain/lib/Sprain/Images.php.
You can read more about the PSR-0 standard : https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-0.md#underscores-in-namespaces-and-class-names

Answer 2

You just need to modify your composer.json file for the autoload value:
http://getcomposer.org/doc/04-schema.md#autoload
//composer.json in your symfony 2.1 project
"autoload": {
"psr-0": {
"": "src/",
"YourLibrary": "src/location/of/lib"
}
},
And then in your controller for example:
namespace Acme\UserBundle\Controller;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
use YourLibrary\FolderName\ClassName.php;
class DefaultController extends Controller {
/**
* #Route("/")
* #Template()
*/
public function indexAction()
{
$lib = new ClassName();
$lib->getName();
return array('name' => $name);
}
}