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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace NuvoleWeb\Drupal\DrupalExtension\ServiceContainer;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\DependencyInjection\ContainerBuilder;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\Config\FileLocator;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\Config\Definition\Builder\ArrayNodeDefinition;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Drupal\DrupalExtension\ServiceContainer\DrupalExtension as OriginalDrupalExtension;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Class DrupalExtension.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @package NuvoleWeb\Drupal\DrupalExtension\ServiceContainer  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                 */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                class DrupalExtension extends OriginalDrupalExtension { | 
            
            
                                                                        
                            
            
                                    
            
            
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                  /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                   * {@inheritdoc} | 
            
            
                                                                        
                            
            
                                    
            
            
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                   */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                  public function load(ContainerBuilder $container, array $config) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    parent::load($container, $config);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    // Search for services.yml in following paths in order to perform overrides.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    $paths[] = __DIR__ . '/../../..';  | 
            
                            
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                    $paths[] = $container->getParameter('paths.base'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    $container_overrides = new ContainerBuilder();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    $loader = new YamlFileLoader($container_overrides, new FileLocator($paths));  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    $loader->load('services.yml'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    $container->merge($container_overrides);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    $this->loadContextInitializer($container);  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                  }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                  /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                   * Load context initializer.  | 
            
            
                                                                        
                            
            
                                    
            
            
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                   *  | 
            
            
                                                                        
                            
            
                                    
            
            
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                   * @param \Symfony\Component\DependencyInjection\ContainerBuilder $container  | 
            
            
                                                                        
                            
            
                                    
            
            
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                   *    Service container instance.  | 
            
            
                                                                        
                            
            
                                    
            
            
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                   */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                  private function loadContextInitializer(ContainerBuilder $container) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    // Set current service container instance for service container initializer.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    $definition = $container->getDefinition('drupal.behat.context_initializer.service_container'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    $definition->addArgument($container);  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                  }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                  /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                   * {@inheritdoc} | 
            
            
                                                                        
                            
            
                                    
            
            
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                   */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                  public function configure(ArrayNodeDefinition $builder) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    parent::configure($builder);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    // @codingStandardsIgnoreStart  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    $builder->  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                      children()->  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        arrayNode('text')-> | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                          info(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'Text strings, such as Log out or the Username field can be altered via behat.yml if they vary from the default values.' . PHP_EOL  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            . '  log_out: "Sign out"' . PHP_EOL  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            . '  log_in: "Sign in"' . PHP_EOL  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            . '  password_field: "Enter your password"' . PHP_EOL  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            . '  username_field: "Nickname"' . PHP_EOL  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            . '  node_submit_label: "Save"'  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                          )->  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                          addDefaultsIfNotSet()->  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            children()->  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                              scalarNode('log_in')-> | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                defaultValue('Log in')-> | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                              end()->  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                              scalarNode('log_out')-> | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                defaultValue('Log out')-> | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                              end()->  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                              scalarNode('password_field')-> | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                defaultValue('Password')-> | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                              end()->  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                              scalarNode('username_field')-> | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                defaultValue('Username')-> | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                              end()->  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                              scalarNode('node_submit_label')-> | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                defaultValue('Save')-> | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                              end()->  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                          end()->  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        end()->  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                      end();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    // @codingStandardsIgnoreEnd  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                  }  | 
            
            
                                                        
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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Adding an explicit array definition is generally preferable to implicit array definition as it guarantees a stable state of the code.
Let’s take a look at an example:
As you can see in this example, the array
$myArrayis initialized the first time when the foreach loop is entered. You can also see that the value of thebarkey is only written conditionally; thus, its value might result from a previous iteration.This might or might not be intended. To make your intention clear, your code more readible and to avoid accidental bugs, we recommend to add an explicit initialization $myArray = array() either outside or inside the foreach loop.