本文实例讲述了PHP实现的观察者模式。分享给大家供大家参考，具体如下：

<?php  //定义观察者调用接口  class transfer{    protected $_observers = array();    //注册对象    public function register($sub){      $this->_observers[] = $sub;    }    //外部统一调用    public function trigger(){      if(!empty($this->_observers)){        foreach($this->_observers as $observer){          $observer->update();        }      }    }  }  //观察者接口  interface obserable{    public function update();  }  //实现观察者  class listen implements obserable{    public function update(){      echo "now first time you need to do listen<br/>";    }  }  class read implements obserable{    public function update(){      echo "now first time you need to read<br/>";    }  }  class speak implements obserable{    public function update(){      echo "now first time you need to speak<br/>";    }  }  class write implements obserable{    public function update(){      echo "now first time you need to write<br/>";    }  }  $transfer = new transfer();  $transfer->register(new listen());  $transfer->register(new read());  $transfer->register(new speak());  $transfer->register(new write());  $transfer->trigger();

更多关于PHP相关内容感兴趣的读者可查看本站专题：《php面向对象程序设计入门教程》、《PHP基本语法入门教程》、《PHP网络编程技巧总结》、《PHP数组(Array)操作技巧大全》、《php字符串(string)用法总结》、《php+mysql数据库操作入门教程》及《php常见数据库操作技巧汇总》

希望本文所述对大家PHP程序设计有所帮助。