觀察者模式，觀察者模式類圖_PHP教程

觀察者模式，觀察者模式類圖

觀察者模式

php    //定義觀察者調用介面    class transfer{        protected $_observers = array();                //註冊對象        public function register($sub){            $this->_observers[] = $sub;            }                //外部統一調用        public function trigger(){            if(!empty($this->_observers)){                foreach($this->_observers as $observer){                    $observer->update();                }                }        }    }        //觀察者介面    interface obserable{        public function update();    }        //實現觀察者    class listen implements obserable{        public function update(){            echo 'now first time you need to do listen
';        }    }        class read implements obserable{        public function update(){            echo 'now first time you need to read
';        }    }        class speak implements obserable{        public function update(){            echo 'now first time you need to speak
';        }    }        class write implements obserable{        public function update(){            echo 'now first time you need to write
';        }    }        $transfer = new transfer();    $transfer->register(new listen());    $transfer->register(new read());    $transfer->register(new speak());    $transfer->register(new write());    $transfer->trigger();                                                    

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