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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Classes en rapport avec les observers  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @author Vermeulen Maxime <[email protected]>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @version 1.0  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace BFW;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use \Exception;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use \SplSubject;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Classe Observer  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @package bfw  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class Observer implements \SplObserver  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Méthode par défaut appelé lorsque l'observer se déclanche  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *   | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param SplSubject $subject Le sujet déclanchant l'observer  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function update(SplSubject $subject)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                          | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                             1                          | 
                
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                      | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Méthode appelé lorsque l'observer se déclanche via la classe Kernel  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *   | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param SplSubject $subject Le sujet déclanchant l'observer  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string     $action  L'action à faire lors du déclanchement  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *   | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @throws \Exception : Si le paramètre $subject n'est pas un objet ou n'est pas une instance de \BFW\Kernel  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                        
            
                                    
            
            
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                    public function updateWithAction($subject, $action)  | 
            
            
                                                        
            
                                    
            
            
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                    { | 
            
            
                                                        
            
                                    
            
            
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                        if(!is_object($subject))  | 
            
            
                                                        
            
                                    
            
            
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                            throw new Exception('Le paramètre $subject doit être un objet.'); | 
            
            
                                                        
            
                                    
            
            
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                        }  | 
            
            
                                                        
            
                                    
            
            
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                        elseif(is_object($subject) && get_class($subject) != '\SplSubject')  | 
            
            
                                                        
            
                                    
            
            
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                        { | 
            
            
                                                        
            
                                    
            
            
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                            throw new Exception('Le paramètre $subject doit être un objet de type \SplSubject.'); | 
            
            
                                                        
            
                                    
            
            
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                        }  | 
            
            
                                                        
            
                                    
            
            
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                        //Gestion de l'action.  | 
            
            
                                                        
            
                                    
            
            
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                        /*  | 
            
            
                                                        
            
                                    
            
            
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                         * $action :   | 
            
            
                                                        
            
                                    
            
            
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                         *  Maclass::MaMethode()  | 
            
            
                                                        
            
                                    
            
            
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                         *  Maclass->MaMethode()  | 
            
            
                                                        
            
                                    
            
            
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                         *  MaFonction()  | 
            
            
                                                        
            
                                    
            
            
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                        */  | 
            
            
                                                        
            
                                    
            
            
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                        //Il faut gérer la porter des variables (classe/arguments)  | 
            
            
                                                        
            
                                    
            
            
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                        $class = null;  | 
            
            
                                                        
            
                                    
            
            
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                        $args = null;  | 
            
                            
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                        $match = array();  | 
            
            
                                                        
            
                                    
            
            
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                        $regex = '([0-9a-zA-Z.,_-]+)';  | 
            
            
                                                        
            
                                    
            
            
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                        $regex2 = '([0-9a-zA-Z.,_-]*)';  | 
            
            
                                                        
            
                                    
            
            
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                        if(strpos($action, '::') !== false)  | 
            
            
                                                        
            
                                    
            
            
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                        { | 
            
            
                                                        
            
                                    
            
            
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                            $preg_match = preg_match('^'.$regex.'::'.$regex.'\('.$regex2.'\);$', $action, $match); | 
            
            
                                                        
            
                                    
            
            
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                            $class = $match[1];  | 
            
            
                                                        
            
                                    
            
            
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                            $args = $match[3];  | 
            
            
                                                        
            
                                    
            
            
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                        }  | 
            
            
                                                        
            
                                    
            
            
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                        elseif(strpos($action, '->') !== false)  | 
            
            
                                                        
            
                                    
            
            
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                        { | 
            
            
                                                        
            
                                    
            
            
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                            $preg_match = preg_match('^'.$regex.'::'.$regex.'\('.$regex2.'\);$', $action, $match); | 
            
            
                                                        
            
                                    
            
            
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                            $class = $match[1];  | 
            
            
                                                        
            
                                    
            
            
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                            $args = $match[3];  | 
            
            
                                                        
            
                                    
            
            
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                        }  | 
            
            
                                                        
            
                                    
            
            
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                        else  | 
            
            
                                                        
            
                                    
            
            
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                        { | 
            
            
                                                        
            
                                    
            
            
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                            $preg_match = preg_match('^'.$regex.'\('.$regex2.'\);$', $action, $match); | 
            
            
                                                        
            
                                    
            
            
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                            $args = $match[2];   | 
            
            
                                                        
            
                                    
            
            
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                        }  | 
            
            
                                                        
            
                                    
            
            
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                        if(!is_null($class))  | 
            
            
                                                        
            
                                    
            
            
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                        { | 
            
            
                                                        
            
                                    
            
            
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                            $class = str_replace('$', '', $class); | 
            
            
                                                        
            
                                    
            
            
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                            global ${$class}; | 
            
            
                                                        
            
                                    
            
            
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                        }  | 
            
            
                                                        
            
                                    
            
            
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                        if(!is_null($args))  | 
            
            
                                                        
            
                                    
            
            
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                        { | 
            
            
                                                        
            
                                    
            
            
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                            $args = explode(',', $args); | 
            
            
                                                        
            
                                    
            
            
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                            foreach($args as $arg)  | 
            
            
                                                        
            
                                    
            
            
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                            { | 
            
            
                                                        
            
                                    
            
            
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                                $arg = str_replace('$', '', $arg); | 
            
            
                                                        
            
                                    
            
            
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                                global ${$arg}; | 
            
            
                                                        
            
                                    
            
            
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                            }  | 
            
            
                                                        
            
                                    
            
            
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                        }  | 
            
            
                                                        
            
                                    
            
            
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                        try  | 
            
            
                                                        
            
                                    
            
            
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                        { | 
            
            
                                                        
            
                                    
            
            
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                            eval($action);  | 
            
            
                                                        
            
                                    
            
            
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                        }  | 
            
            
                                                        
            
                                    
            
            
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                        catch(\Exception $e)  | 
            
                            
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                        { | 
            
            
                                                        
            
                                    
            
            
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                            echo $e->getMessage();  | 
            
            
                                                        
            
                                    
            
            
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                        }  | 
            
            
                                                        
            
                                    
            
            
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                    }  | 
            
            
                                                        
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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This check looks for variable assignements that are either overwritten by other assignments or where the variable is not used subsequently.
Both the
$myVarassignment in line 1 and the$higherassignment in line 2 are dead. The first because$myVaris never used and the second because$higheris always overwritten for every possible time line.