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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace WPEmerge\Routing;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Closure;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Exception;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use WPEmerge\Middleware\HasMiddlewareTrait;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use WPEmerge\Request;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use WPEmerge\Routing\Conditions\ConditionInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use WPEmerge\Routing\Conditions\Url as UrlCondition;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                class RouteGroup implements RouteInterface, HasRoutesInterface { | 
            
            
                                                                        
                            
            
                                    
            
            
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                	use HasRoutesTrait { | 
            
            
                                                                        
                            
            
                                    
            
            
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                		route as traitRoute;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	use HasMiddlewareTrait { | 
            
            
                                                                        
                            
            
                                    
            
            
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                		addMiddleware as traitAddMiddleware;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	 * Route target  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	 *  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	 * @var ConditionInterface  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	 */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	protected $target = null;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	 * Constructor  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	 *  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	 * @throws Exception  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	 * @param  string|ConditionInterface $target  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	 * @param  Closure                   $closure  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	public function __construct( $target, Closure $closure ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		if ( is_string( $target ) ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			$target = new UrlCondition( $target );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		if ( ! is_a( $target, UrlCondition::class ) ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			throw new Exception( 'Route groups can only use route strings.' );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$this->target = $target;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$closure( $this );  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                	}  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	 * Get the first child route which is satisfied  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	 *  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	 * @return RouteInterface|null  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	protected function getSatisfiedRoute( Request $request ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$routes = $this->getRoutes();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		foreach ( $routes as $route ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			if ( $route->isSatisfied( $request ) ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                				return $route;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		return null;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                	}  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	 * {@inheritDoc} | 
            
            
                                                                        
                            
            
                                    
            
            
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                	 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	public function isSatisfied( Request $request ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$route = $this->getSatisfiedRoute( $request );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		return $route !== null;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                	}  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	 * {@inheritDoc} | 
            
            
                                                                        
                            
            
                                    
            
            
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                	 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	public function handle( Request $request, $template ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$route = $this->getSatisfiedRoute( $request );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		return $route ? $route->handle( $request, $template ) : null;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                	}  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	 * {@inheritDoc} | 
            
            
                                                                        
                            
            
                                    
            
            
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                	 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	public function route( $methods, $target, $handler ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		if ( is_string( $target ) ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			$target = new UrlCondition( $target );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		if ( ! is_a( $target, UrlCondition::class ) ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			throw new Exception( 'Routes inside route groups can only use route strings.' );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$target = $this->target->concatenate( $target );  | 
            
                            
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                		return $this->traitRoute( $methods, $target, $handler );  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                	}  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	 * {@inheritDoc} | 
            
            
                                                                        
                            
            
                                    
            
            
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                	 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	public function addMiddleware( $middleware ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$routes = $this->getRoutes();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		foreach ( $routes as $route ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			$route->addMiddleware( $middleware );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		return $this->traitAddMiddleware( $middleware );  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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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: