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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /*  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * This file is part of Sulu.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * (c) MASSIVE ART WebServices GmbH  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * This source file is subject to the MIT license that is bundled  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * with this source code in the file LICENSE.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace Sulu\Bundle\ActivityLogBundle\DependencyInjection;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\Config\Definition\Exception\InvalidConfigurationException;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\Config\FileLocator;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\DependencyInjection\ContainerBuilder;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\DependencyInjection\Extension\Extension;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\DependencyInjection\Loader;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\DependencyInjection\Reference;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * This is the class that loads and manages activity log bundle configuration.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class SuluActivityLogExtension extends Extension  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    const STORAGE_ELASTIC = 'elastic';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    const STORAGE_ARRAY = 'array';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    const STORAGE_CUSTOM = 'custom';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * {@inheritdoc} | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function load(array $configs, ContainerBuilder $container)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $configuration = new Configuration();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $config = $this->processConfiguration($configuration, $configs);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        switch ($config['storage']) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            case self::STORAGE_ELASTIC:  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $id = $this->initElasticSearch($config['storages']['elastic'], $container);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                break;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            case self::STORAGE_ARRAY:  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $id = $this->initArray($config['storages']['array'], $container);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                break;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            case self::STORAGE_CUSTOM:  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $id = $this->initCustom($config['storages']['custom']);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                break;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $container->setAlias('sulu_activity_log.activity_log_storage', $id); | 
            
                            
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                        $loader = new Loader\XmlFileLoader($container, new FileLocator(__DIR__ . '/../Resources/config'));  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $loader->load('services.xml'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param array $config  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param ContainerBuilder $container  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return string  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private function initElasticSearch(array $config, ContainerBuilder $container)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $loader = new Loader\XmlFileLoader($container, new FileLocator(__DIR__ . '/../Resources/config'));  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $loader->load('storages/elastic.xml'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (!$config['ongr_manager']) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $error = new InvalidConfigurationException();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $error->setPath('sulu_activity_log.storages.elastic.ongr_manager'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            throw $error;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $container->getDefinition('sulu_activity_log.storage.elastic')->replaceArgument( | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            0,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            new Reference('es.manager.' . $config['ongr_manager']) | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return 'sulu_activity_log.storage.elastic';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private function initArray($config, $container)  | 
            
                            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $loader = new Loader\XmlFileLoader($container, new FileLocator(__DIR__ . '/../Resources/config'));  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $loader->load('storages/array.xml'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return 'sulu_activity_log.storage.array';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    private function initCustom($config)  | 
            
            
                                                        
            
                                    
            
            
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                    { | 
            
            
                                                        
            
                                    
            
            
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                        if (!$config['id']) { | 
            
            
                                                        
            
                                    
            
            
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                            $error = new InvalidConfigurationException();  | 
            
            
                                                        
            
                                    
            
            
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                            $error->setPath('sulu_activity_log.storages.custom.id'); | 
            
            
                                                        
            
                                    
            
            
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                            throw $error;  | 
            
            
                                                        
            
                                    
            
            
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                        }  | 
            
            
                                                        
            
                                    
            
            
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                        return 'sulu_activity_log.storage.custom';  | 
            
            
                                                        
            
                                    
            
            
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                    }  | 
            
            
                                                        
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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If you define a variable conditionally, it can happen that it is not defined for all execution paths.
Let’s take a look at an example:
In the above example, the variable $x is defined if you pass “foo” or “bar” as argument for $a. However, since the switch statement has no default case statement, if you pass any other value, the variable $x would be undefined.
Available Fixes
Check for existence of the variable explicitly:
Define a default value for the variable:
Add a value for the missing path: