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                <?php  | 
            
                            
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                use Symfony\Component\HttpKernel\Kernel;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\Config\Loader\LoaderInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                require_once __DIR__.'/autoload.php';  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                class AppKernel extends Kernel  | 
            
            
                                                                        
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function registerBundles()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $bundles = array(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            new Symfony\Bundle\FrameworkBundle\FrameworkBundle(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            new Symfony\Bundle\SecurityBundle\SecurityBundle(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            new Symfony\Bundle\TwigBundle\TwigBundle(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            new Symfony\Bundle\MonologBundle\MonologBundle(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            new Symfony\Bundle\SwiftmailerBundle\SwiftmailerBundle(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            new Symfony\Bundle\AsseticBundle\AsseticBundle(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            new Doctrine\Bundle\DoctrineBundle\DoctrineBundle(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            new Sensio\Bundle\FrameworkExtraBundle\SensioFrameworkExtraBundle(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            new Mvc\BlogBundle\MvcBlogBundle(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            new Mykees\MediaBundle\MykeesMediaBundle(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            new Mykees\TagBundle\MykeesTagBundle(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            new FOS\UserBundle\FOSUserBundle(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            new Liip\FunctionalTestBundle\LiipFunctionalTestBundle(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $bundles;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @param LoaderInterface $loader  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @return null  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function registerContainerConfiguration(LoaderInterface $loader)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $loader->load(__DIR__.'/config/config_'.$this->getEnvironment().'.yml');  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @return string  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getCacheDir()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return sys_get_temp_dir().'/'.$this->environment.'/cache';  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @return string  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getLogDir()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return sys_get_temp_dir().'/'.$this->environment.'/logs';  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                        
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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The PSR-1: Basic Coding Standard recommends that a file should either introduce new symbols, that is classes, functions, constants or similar, or have side effects. Side effects are anything that executes logic, like for example printing output, changing ini settings or writing to a file.
The idea behind this recommendation is that merely auto-loading a class should not change the state of an application. It also promotes a cleaner style of programming and makes your code less prone to errors, because the logic is not spread out all over the place.
To learn more about the PSR-1, please see the PHP-FIG site on the PSR-1.