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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /*  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * This file is part of the PommProject/PommBundle package.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * (c) 2018 Grégoire HUBERT <[email protected]>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * For the full copyright and license information, please view the LICENSE  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * file that was distributed with this source code.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace PommProject\PommBundle\Controller;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\HttpFoundation\Request;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\HttpFoundation\Response;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\Routing\Generator\UrlGeneratorInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\HttpKernel\Profiler\Profiler;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use PommProject\Foundation\Pomm;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Controllers for the Pomm profiler extension.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @package PommBundle  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @copyright 2018 Grégoire HUBERT  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @author Grégoire HUBERT  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @license X11 {@link http://opensource.org/licenses/mit-license.php} | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                 */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                class PommProfilerController  | 
            
            
                                                                        
                            
            
                                    
            
            
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                { | 
            
            
                                                                        
                            
            
                                    
            
            
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                    private $generator;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    private $profiler;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    private $twig;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    private $pomm;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function __construct(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        UrlGeneratorInterface $generator,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        Profiler $profiler,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        \Twig_Environment $twig,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        Pomm $pomm  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->generator = $generator;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->profiler  = $profiler;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->twig      = $twig;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->pomm      = $pomm;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * Controller to explain a SQL query.  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @param $request  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @param string $token  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @param int $index_query  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @return Response  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function explainAction(Request $request, $token, $index_query)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $panel = 'pomm';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $page  = 'home';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (!($profile = $this->profiler->loadProfile($token))) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return new Response(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $this->twig->render(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    '@WebProfiler/Profiler/info.html.twig',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    array('about' => 'no_token', 'token' => $token) | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                ),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                200,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                array('Content-Type' => 'text/html') | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->profiler->disable();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (!$profile->hasCollector($panel)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            throw new NotFoundHttpException(sprintf('Panel "%s" is not available for token "%s".', $panel, $token)); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (!array_key_exists($index_query, $profile->getCollector($panel)->getQueries())) { | 
            
                            
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                            throw new \InvalidArgumentException(sprintf("No such query index '%s'.", $index_query)); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $query_data = $profile->getCollector($panel)->getQueries()[$index_query];  | 
            
                            
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                        $explain = $this->pomm[$query_data['session_stamp']]  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ->getClientUsingPooler('query_manager', null) | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ->query(sprintf("explain %s", $query_data['sql']), $query_data['parameters']); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return new Response($this->twig->render('@Pomm/Profiler/explain.html.twig', array( | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'token' => $token,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'profile' => $profile,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'collector' => $profile->getCollector($panel),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'panel' => $panel,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'page' => $page,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'request' => $request,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'query_index' => $index_query,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'explain' => $explain,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        )), 200, array('Content-Type' => 'text/html')); | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                        
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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Let’s take a look at an example:
In the above example, the authenticate() method works fine as long as you just pass instances of MyUser. However, if you now also want to pass a different implementation of User which does not have a getDisplayName() method, the code will break.
Available Fixes
Change the type-hint for the parameter:
Add an additional type-check:
Add the method to the interface: