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copied!<p>Usually you include those in your project with <a href="http://getcomposer.com/" rel="nofollow">Composer</a>. I suggest you to take a look at <a href="http://packagist.org/" rel="nofollow">packagist</a> to look if there is a Composer package for your class, otherwise you can't require it with composer.</p> <p>Composer puts your classes in the <code>vendor</code> directory, you should put all 'vendors' (3th party libraries) there. Take a look on where to put them in that directory, so that the Composer autoloader can autoload it.</p> <p>After that, it is recommend to create a bundle for that specific class. It is a best practise to create a service there. For instance, if your class is <code>Foo</code> you create a <code>Acme\FooBundle</code> which loads the <code>Foo</code> service:</p> <pre class="lang-php prettyprint-override"><code>// src/Acme/FooBundle/DependencyInjection/AcmeFooExtension.php <?php namespace Acme\FooBundle\DependencyInjection; use Symfony\Component\Config\FileLocator; use Symfony\Component\DependencyInjection\ContainerBuilder; use Symfony\Component\DependencyInjection\Loader\XmlFileLoader; use Symfony\Component\HttpKernel\DependencyInjection\Extension; class AcmeFooExtension extends Extension { /** * this method loads the Service Container services. */ public function load(array $configs, ContainerBuilder $container) { $loader = new XmlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config')); // load the src/Acme/FooBundle/Resources/config/services.xml file $loader->load('services.xml'); } </code></pre> <pre class="lang-xml prettyprint-override"><code> <?xml version="1.0" encoding="UTF-8" ?> <container xmlns="http://symfony.com/schema/dic/services" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd"> <services>  <service id="acme_foo.foo" class="\Foo" ></service> </services> </container> </code></pre>

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