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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace ETNA\Silex\Provider\RabbitMQ;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Saxulum\Console\Command\AbstractPimpleCommand;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\Console\Input\InputArgument;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\Console\Input\InputInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\Console\Input\InputOption;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\Console\Output\OutputInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class Consumer extends AbstractPimpleCommand  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                { | 
            
            
                                                                        
                            
            
                                    
            
            
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                    protected function configure()  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $this  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            ->setName('rabbitmq:consumer') | 
            
            
                                                                        
                            
            
                                    
            
            
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                            ->addArgument('name', InputArgument::REQUIRED, 'Consumer Name') | 
            
            
                                                                        
                            
            
                                    
            
            
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                            ->addOption('messages', 'm', InputOption::VALUE_OPTIONAL, 'Messages to consume', 0) | 
            
            
                                                                        
                            
            
                                    
            
            
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                            ->addOption('route', 'r', InputOption::VALUE_OPTIONAL, 'Routing Key', '') | 
            
            
                                                                        
                            
            
                                    
            
            
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                            ->addOption('memory-limit', 'l', InputOption::VALUE_OPTIONAL, 'Allowed memory for this process', null) | 
            
            
                                                                        
                            
            
                                    
            
            
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                            ->addOption('debug', 'd', InputOption::VALUE_NONE, 'Enable Debugging') | 
            
            
                                                                        
                            
            
                                    
            
            
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                        ;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Executes the current command.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param InputInterface  $input  An InputInterface instance  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param OutputInterface $output An OutputInterface instance  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return integer|null 0 if everything went fine, or an error code  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @throws \InvalidArgumentException When the number of messages to consume is less than 0  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @throws \BadFunctionCallException When the pcntl is not installed and option -s is true  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function execute(InputInterface $input, OutputInterface $output)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (defined('AMQP_DEBUG') === false) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            define('AMQP_DEBUG', (bool) $input->getOption('debug')); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->amount = $input->getOption('messages'); | 
            
                            
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                        if (!is_int($this->amount) || 0 > $this->amount) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            throw new \InvalidArgumentException("The -m option should be null or greater than 0"); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->consumer = $this->getConsumerInstance($input);  | 
            
                            
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                        if (  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            !is_null($input->getOption('memory-limit')) && | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ctype_digit((string)$input->getOption('memory-limit')) && | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $input->getOption('memory-limit') > 0 | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->consumer->setMemoryLimit($input->getOption('memory-limit')); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->consumer->setRoutingKey($input->getOption('route')); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->consumer->consume($this->amount);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param InputInterface $input  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function getConsumerInstance($input)  | 
            
                            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $app = $this->container;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $app['rabbit.consumer'][$input->getArgument('name')]; | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: