| 1 |  |  | <?php | 
            
                                                                                                            
                            
            
                                    
            
            
                | 2 |  |  | /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 3 |  |  |  * InArray | 
            
                                                                                                            
                            
            
                                    
            
            
                | 4 |  |  |  * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 5 |  |  |  * @category  StrokerForm\Renderer\JqueryValidate\Rule | 
            
                                                                                                            
                            
            
                                    
            
            
                | 6 |  |  |  * @package   StrokerForm\Renderer\JqueryValidate\Rule | 
            
                                                                                                            
                            
            
                                    
            
            
                | 7 |  |  |  * @copyright 2013 ACSI Holding bv (http://www.acsi.eu) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 8 |  |  |  * @version   SVN: $Id$ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 9 |  |  |  */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 10 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 11 |  |  | namespace StrokerForm\Renderer\JqueryValidate\Rule; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 12 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 13 |  |  | use Zend\Form\ElementInterface; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 14 |  |  | use Zend\Validator\ValidatorInterface; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 15 |  |  | use Zend\Validator\InArray as InArrayValidator; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 16 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 17 |  |  | class InArray extends AbstractRule | 
            
                                                                                                            
                            
            
                                    
            
            
                | 18 |  |  | { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 19 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 20 |  |  |      * Get the validation rules | 
            
                                                                                                            
                            
            
                                    
            
            
                | 21 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 22 |  |  |      * @param  \Zend\Validator\ValidatorInterface $validator | 
            
                                                                                                            
                            
            
                                    
            
            
                | 23 |  |  |      * @param \Zend\Form\ElementInterface         $element | 
            
                                                                                                            
                            
            
                                    
            
            
                | 24 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 25 |  |  |      * @return array | 
            
                                                                                                            
                            
            
                                    
            
            
                | 26 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 27 |  |  |     public function getRules(ValidatorInterface $validator, ElementInterface $element = null) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 28 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 29 |  |  |         // Javascript doesn't support associative arrays. Therefore, check if the array is associative, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 30 |  |  |         // and if so, transform it to a non-associative one. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 31 |  |  |         if (array_keys($validator->getHaystack()) !== range(0, count($validator->getHaystack()) - 1)) { | 
                            
                    |  |  |  | 
                                                                                        
                                                                                     | 
            
                                                                                                            
                            
            
                                    
            
            
                | 32 |  |  |             return array('in_array' => array_values($validator->getHaystack())); | 
                            
                    |  |  |  | 
                                                                                        
                                                                                     | 
            
                                                                                                            
                            
            
                                    
            
            
                | 33 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 34 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 35 |  |  |         return array('in_array' => (array)$validator->getHaystack()); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 36 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 37 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 38 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 39 |  |  |      * Get the validation message | 
            
                                                                                                            
                            
            
                                    
            
            
                | 40 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 41 |  |  |      * @param  \Zend\Validator\ValidatorInterface $validator | 
            
                                                                                                            
                            
            
                                    
            
            
                | 42 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 43 |  |  |      * @return string | 
            
                                                                                                            
                            
            
                                    
            
            
                | 44 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 45 |  |  |     public function getMessages(ValidatorInterface $validator) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 46 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 47 |  |  |         return array( | 
            
                                                                                                            
                            
            
                                    
            
            
                | 48 |  |  |             'in_array' => | 
            
                                                                                                            
                            
            
                                    
            
            
                | 49 |  |  |                 $this->translateMessage('The input is not a valid option') | 
            
                                                                                                            
                            
            
                                    
            
            
                | 50 |  |  |         ); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 51 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 52 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 53 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 54 |  |  |      * Whether this rule supports certain validators | 
            
                                                                                                            
                            
            
                                    
            
            
                | 55 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 56 |  |  |      * @param ValidatorInterface $validator | 
            
                                                                                                            
                            
            
                                    
            
            
                | 57 |  |  |      * @return mixed | 
            
                                                                                                            
                                                                
            
                                    
            
            
                | 58 |  |  |      */ | 
            
                                                        
            
                                    
            
            
                | 59 |  |  |     public function canHandle(ValidatorInterface $validator) | 
            
                                                        
            
                                    
            
            
                | 60 |  |  |     { | 
            
                                                        
            
                                    
            
            
                | 61 |  |  |         return $validator instanceof InArrayValidator; | 
            
                                                        
            
                                    
            
            
                | 62 |  |  |     } | 
            
                                                        
            
                                    
            
            
                | 63 |  |  | } | 
            
                                                        
            
                                    
            
            
                | 64 |  |  |  | 
            
                        
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: