Mediator.class.php

<?php 

  abstract class Colleague{
      protected $mediator;
      abstract public function sendMsg($who,$msg);
      abstract public function receiveMsg($msg);
      public function setMediator(Mediator $mediator){
          $this->mediator = $mediator;
      }
  }

  class ColleagueA extends Colleague
  {
      public function sendMsg($toWho,$msg)
      {
          echo "Send Msg From ColleagueA To: ".$toWho . '<br>';
          $this->mediator->opreation($toWho,$msg);
      }

      public function receiveMsg($msg)
      {
          echo "ColleagueA Receive Msg: ".$msg . '<br>';
      }
  }

  class ColleagueB extends Colleague
  {
      public function sendMsg($toWho,$msg)
      {
          echo "Send Msg From ColleagueB To: ".$toWho . '<br>';
          $this->mediator->opreation($toWho,$msg);
      }

      public function receiveMsg($msg)
      {
          echo "ColleagueB Receive Msg: ".$msg . '<br>';
      }
  }

  abstract class Mediator{
      abstract public function opreation($id,$message);
      abstract public function register($id,Colleague $colleague);
  }

  class MyMediator extends Mediator
  {
      protected static $colleagues;
      function __construct()
      {
          if (!isset(self::$colleagues)) {
              self::$colleagues = [];
          }
      }

      public function opreation($id,$message)
      {
          if (!array_key_exists($id,self::$colleagues)) {
              echo "colleague not found";
              return;
          }
          $colleague = self::$colleagues[$id];
          $colleague->receiveMsg($message);
      }

      public function register($id,Colleague $colleague)
      {
          if (!in_array($colleague, self::$colleagues)) {
              self::$colleagues[$id] = $colleague;
          }
          $colleague->setMediator($this);
      }
  }

  $colleagueA = new ColleagueA();
  $colleagueB = new ColleagueB();
  $mediator = new MyMediator();
  $mediator->register(1,$colleagueA);
  $mediator->register(2,$colleagueB);
  $colleagueA->sendMsg(2,'hello admin');
  $colleagueB->sendMsg(1,'shiyanlou');