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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace Pagerfanta\View\Template;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Pagerfanta\View\Template\Template;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @author Vitor Mattos <[email protected]>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class TelegramInlineTemplate extends Template  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    static protected $defaultOptions = array(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        'first_page_template' => '« %text%',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        'last_page_template'  => '%text% »',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        'previous_template'   => '‹ %text%',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        'next_template'       => '%text% ›',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        'page_template'       => '%text%',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        'current_template'    => '· %text% ·',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function container() { } | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function page($page)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $text = $page;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->pageWithText($page, $text);  | 
            
                            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function pageWithText($page, $text)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return array(  | 
            
                            
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                            'text' => str_replace('%text%', $text, $this->option('page_template')), | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'callback_data' => $this->generateRoute($page),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'page' => $page  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function previousDisabled() { } | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function previousEnabled($page)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->pageWithText($page, str_replace('%text%', $page, $this->option('previous_template'))); | 
            
                            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    public function nextDisabled() { } | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function nextEnabled($page)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->pageWithText($page, str_replace('%text%', $page, $this->option('next_template'))); | 
            
                            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function first()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $text = str_replace('%text%', 1, $this->option('first_page_template')); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->pageWithText(1, $text);  | 
            
                            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function last($page)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $text = str_replace('%text%', $page, $this->option('last_page_template')); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->pageWithText($page, $text);  | 
            
                            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function current($page)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $text = str_replace('%text%', $page, $this->option('current_template')); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->pageWithText($page, $text);  | 
            
                            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function separator() { } | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private function generateSpan($class, $page)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $search = array('%class%', '%text%'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $replace = array($class, $page);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return str_replace($search, $replace, $this->option('span_template')); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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If you return a value from a function or method, it should be a sub-type of the type that is given by the parent type f.e. an interface, or abstract method. This is more formally defined by the Lizkov substitution principle, and guarantees that classes that depend on the parent type can use any instance of a child type interchangably. This principle also belongs to the SOLID principles for object oriented design.
Let’s take a look at an example:
Our function
my_functionexpects aPostobject, and outputs the author of the post. The base classPostreturns a simple string and outputting a simple string will work just fine. However, the child classBlogPostwhich is a sub-type ofPostinstead decided to return anobject, and is therefore violating the SOLID principles. If aBlogPostwere passed tomy_function, PHP would not complain, but ultimately fail when executing thestrtouppercall in its body.