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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace LaravelLangBundler\BundleItems;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Illuminate\Container\Container;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use LaravelLangBundler\Exceptions\InvalidModificationArgument;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class ItemFactory  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Allowed values for BundleItem target property.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var array  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    const ALLOWEDTARGETS = [  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        'value',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        'key',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        'both',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    ];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Build a BundleItem instance.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $id  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $type       Filename_affected  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param array  $parameters  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return BundleItem  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public static function build($id, $type = null, array $parameters = [])  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        if (is_null($type)) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            return new BundleItem($id);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        list($target, $name) = explode('_', $type); | 
            
            
                                                                        
                            
            
                                    
            
            
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                        self::validateTarget($target);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $className = ucfirst($name).'Mod';  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $appNamespace = Container::getInstance()->getNamespace();  | 
            
                            
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                        $localClass = "\\{$appNamespace}LangBundler\\Mods\\{$className}"; | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $vendorClass = "\LaravelLangBundler\\BundleItems\\Mods\\{$className}"; | 
            
            
                                                                        
                            
            
                                    
            
            
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                        if (class_exists($localClass)) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            return new $localClass($id, $target, $parameters);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        } elseif (class_exists($vendorClass)) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            return new $vendorClass($id, $target, $parameters);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        throw InvalidModificationArgument::modifcationClassNotFound($className);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Validate the target.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $target  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @throws InvalidModificationTarget  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected static function validateTarget($target)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (!in_array($target, self::ALLOWEDTARGETS)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            throw InvalidModificationArgument::targetNotAllowed($target);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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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 sub-classes 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 parent class: