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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * This software consists of voluntary contributions made by many individuals  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * and is licensed under the MIT license.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace LearnZF2Acl\Controller;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use LearnZF2Acl\Model\Acl;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Zend\Mvc\Controller\AbstractActionController;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Zend\View\Model\JsonModel;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Zend\View\Model\ViewModel;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Acl Controller.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @author Abdul Malik Ikhsan <[email protected]>  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                 */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                class AclController extends AbstractActionController  | 
            
            
                                                                        
                            
            
                                    
            
            
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                { | 
            
            
                                                                        
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @var Acl  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    private $aclmodel;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * Construct.  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @param Acl $aclmodel  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function __construct(Acl $aclmodel)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->aclmodel = $aclmodel;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function indexAction()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $defaultSelectedRoleId = 0;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return new ViewModel([  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'defaultSelectedRoleId' => $defaultSelectedRoleId,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'roles' => $this->aclmodel->getRoles(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'resources' => $this->aclmodel->getResources(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'rights' => $this->aclmodel->getRightLists(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'resourcesSelected' => $this->aclmodel->getResourceByRole($defaultSelectedRoleId),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'rightsSelected' => $this->aclmodel->getRightLists($defaultSelectedRoleId),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        ]);  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function listresourcesandrightsAction()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $resources = [];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $rights = [];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($this->request->isPost()) { | 
            
                            
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                            $roleId = $this->request->getPost('roleId', 0); | 
            
                            
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                            $resources = $this->aclmodel->getResourceByRole($roleId);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $rights = $this->aclmodel->getRightLists($roleId);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return new JsonModel([  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'resources' => $resources,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'rights' => $rights,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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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 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: