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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /*  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Copyright (c) Arnaud Ligny <[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 Cecil\Step;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Cecil\Collection\Page\Page;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Cecil\Collection\Taxonomy\Collection as VocabulariesCollection;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Cecil\Collection\Taxonomy\Term as Term;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Cecil\Collection\Taxonomy\Vocabulary as Vocabulary;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Cecil\Exception\Exception;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Create taxonomies collection.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class TaxonomiesCreate extends AbstractStep  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var VocabulariesCollection  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected $vocabulariesCollection;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * {@inheritdoc} | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function process()  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        if ($this->config->get('site.taxonomies')) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $this->createVocabulariesCollection();  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $this->collectTermsFromPages();  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $this->builder->setTaxonomies($this->vocabulariesCollection);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        // DEBUG  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        /*foreach ($this->builder->getTaxonomies() as $key => $value) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            echo "$value:\n";  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            foreach ($value as $k => $v) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                                echo "  - $v\n";  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        }*/  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Create a collection from the vocabularies configuration.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function createVocabulariesCollection()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        // create an empty a vocabularies collection  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->vocabulariesCollection = new VocabulariesCollection('taxonomies'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        /*  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                         * Adds each vocabulary to the collection.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                         * ie:  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                         *   taxonomies:  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                         *     - tags: tag  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                         *     - categories: category  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                         */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        foreach (array_keys($this->config->get('site.taxonomies')) as $vocabulary) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            /*  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                             * Disabled vocabulary?  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                             * ie:  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                             *   taxonomies:  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                             *     tags: disabled  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                             */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            if ($this->config->get("site.taxonomies.$vocabulary") == 'disabled') { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                continue;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->vocabulariesCollection->add(new Vocabulary($vocabulary));  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Collects vocabularies/terms from pages frontmatter.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function collectTermsFromPages()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        /* @var $page Page */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $pages = $this->builder->getPages()->sortByDate();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        foreach ($pages as $page) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            // ie: tags  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            foreach ($this->vocabulariesCollection as $vocabulary) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $plural = $vocabulary->getId();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                /*  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                 * ie:  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                 *   tags: Tag 1, Tag 2  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                if ($page->hasVariable($plural)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    // converts a string list to an array  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    if (!is_array($page->getVariable($plural))) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                        $page->setVariable($plural, [$page->getVariable($plural)]);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    // adds each term to the vocabulary collection...  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    foreach ($page->getVariable($plural) as $termName) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                        $termId = Page::slugify($termName);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                        $term = (new Term($termId))->setName($termName);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                        $this->vocabulariesCollection  | 
            
                            
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                                            ->get($plural)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                            ->add($term);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                        // ... and adds page to the term collection  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                        $this->vocabulariesCollection  | 
            
                            
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                                            ->get($plural)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                            ->get($termId)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                            ->add($page);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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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: