今天学习的观察者模式，顺手写了个代码巩固下经验

<?php
/**
* Observer
*/
class BBCal
{
    public $message;
    public $user_list = array();

    public function register($user)
    {
        array_push($this->user_list, $user);
    }

    public function send($message)
    {
        foreach ($this->user_list as $val) {
            $val->receive($message);
        }
    }
}

interface Rote
{
    public function receive($message);
    public function display();
}

class Men implements Rote
{
    public $message;

    public function receive($message)
    {
        $this->message = $message;
        $this->display();
    }

    public function display()
    {
        echo 'this is man receive message:' . $this->message;
    }
}

class Woman implements Rote
{
    public $message;

    public function receive($message)
    {
        $this->message = $message;
        $this->display();
    }

    public function display()
    {
        echo 'this is woman receive message:' . $this->message;
    }
}

$man = new Men();
$woman = new Woman();
$bb = new BBcal();
$bb->register($man);
$bb->register($woman);
$bb->send("please call 01012345678\n");