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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace Azine\MailgunWebhooksBundle\Command;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Azine\MailgunWebhooksBundle\Services\AzineMailgunService;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Azine\MailgunWebhooksBundle\Services\HetrixtoolsService\HetrixtoolsServiceResponse;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Bundle\FrameworkBundle\Command\ContainerAwareCommand;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\Console\Input\InputArgument;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\Console\Output\OutputInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\Console\Input\InputInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Azine\MailgunWebhooksBundle\Entity\Repositories\MailgunEventRepository;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Doctrine\ORM\EntityManager;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Azine\MailgunWebhooksBundle\Services\HetrixtoolsService\AzineMailgunHetrixtoolsService;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Azine\MailgunWebhooksBundle\Services\AzineMailgunMailerService;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Checks if the last ip address from MailgunEvent entity is in blacklist  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class CheckIpAddressIsBlacklistedCommand extends ContainerAwareCommand  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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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('mailgun:check-ip-in-blacklist') | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ->setDescription('Checks if the last ip address from MailgunEvent entity is in blacklist'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        ;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function execute(InputInterface $input, OutputInterface $output)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $eventRepository = $this->getEntityManager()->getRepository('AzineMailgunWebhooksBundle:MailgunEvent'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $translator = $this->getContainer()->get('translator'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $ipAddress = $eventRepository->getLastEvent()->getIp();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $response = $this->getHetrixtoolsService()->checkIpAddressInBlacklist($ipAddress);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if(!$response instanceof HetrixtoolsServiceResponse){ | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $output->write($translator->trans("No response from Hetrixtools service, try later."), true); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return false;  | 
            
                            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if($response->status == HetrixtoolsServiceResponse::RESPONSE_STATUS_SUCCESS){ | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            if($response->blacklisted_count > 0){ | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                try{ | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    $messagesSent = $this->getAzineMailgunServiceService()->sendBlacklistNotification($response);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    if($messagesSent > 0){ | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                        $output->write($translator->trans("Blacklist report was sent."), true); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                catch (\Exception $e){ | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    $output->write($e->getMessage(), true);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Get EntityManager  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return EntityManager  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private function getEntityManager()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->getContainer()->get('doctrine')->getManager(); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Get AzineMailgunHetrixtoolsService  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return AzineMailgunHetrixtoolsService  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private function getHetrixtoolsService()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->getContainer()->get('azine.mailgun.hetrixtools.service'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Get AzineMailgunMailerService  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return AzineMailgunMailerService  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                        
            
                                    
            
            
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                    private function getAzineMailgunServiceService()  | 
            
            
                                                        
            
                                    
            
            
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                    { | 
            
            
                                                        
            
                                    
            
            
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                        return $this->getContainer()->get('azine.mailgun.mailer'); | 
            
            
                                                        
            
                                    
            
            
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                    }  | 
            
            
                                                        
            
                                    
            
            
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                }  | 
            
            
                        
If you return a value from a function or method, it should be a sub-type of the type that is given by the parent type f.e. an interface, or abstract method. This is more formally defined by the Lizkov substitution principle, and guarantees that classes that depend on the parent type can use any instance of a child type interchangably. This principle also belongs to the SOLID principles for object oriented design.
Let’s take a look at an example:
Our function
my_functionexpects aPostobject, and outputs the author of the post. The base classPostreturns a simple string and outputting a simple string will work just fine. However, the child classBlogPostwhich is a sub-type ofPostinstead decided to return anobject, and is therefore violating the SOLID principles. If aBlogPostwere passed tomy_function, PHP would not complain, but ultimately fail when executing thestrtouppercall in its body.