功能:

显示用户及该用户推广进来的下属两级用户

一.User类

/** * Class User */class User{    private $uid;    private $name;    private $level;    public function __construct($uid, $name, $level)    {        $this->uid      = $uid;        $this->name     = $name;        $this->level    = $level;    }    public function getName()    {        return $this->name;    }    public function getUid()    {        return $this->uid;    }}

　　

二.User类的装饰类(装饰类主要实现对User对象信息的更友好的显示)

/** * User类的装饰类 * Class UserDecorator */class UserDecorator{    protected $user;    public function __construct(User $user)    {        $this->user = $user;    }    public function getDisplayHtml($deep)    {        return ''.str_repeat(' ', ($deep-1) * 2) . "用户名:{$this->user->getName()};UID:{$this->user->getUid()}" .'';    }}

　　

三.组合模式

1.抽象构件

/** * 抽象构件 * Class PopUserComponent */abstract class PopUserComponent{    protected $user;    public function __construct(UserDecorator $user)    {        $this->user = $user;    }    abstract public function add(PopUserComponent $user);    abstract public function remove(PopUserComponent $user);    abstract public function display($deep);}

　　

2.一级用户:枝节点

/** * 一级用户:枝节点 * Class FirstLevelPopUsers */class FirstLevelPopUsers extends PopUserComponent{    protected $subordinateUsers = [];    public function add(PopUserComponent $user)    {        $this->subordinateUsers[] = $user;    }    public function remove(PopUserComponent $user)    {        unset($this->subordinateUsers[array_search($user, $this->subordinateUsers)]);    }    public function display($deep)    {        $html = '';        $html .=  $this->user->getDisplayHtml($deep);        $deep += 2;        foreach ($this->subordinateUsers as $eachSubordinateUser) {            $html .= $eachSubordinateUser->display($deep);        }        return $html;    }}

　　

3.二级用户:叶节点

/** * 二级用户:叶节点 * Class SecondLevelPopUsers */class SecondLevelPopUsers extends PopUserComponent{    public function add(PopUserComponent $user)    {        throw new \Exception('不支持该方法');    }    public function remove(PopUserComponent $user)    {        throw new \Exception('不支持该方法');    }    public function display($deep)    {        return $this->user->getDisplayHtml($deep);    }}

　　

四.迭代器

/** * 迭代器 * Class PopUserIterator */class PopUserIterator implements Iterator{    private $users = [];    private $valid = false;    public function __construct()    {        /**         * 此处模拟从数据库读取记录         */        $firstUser = new FirstLevelPopUsers(new UserDecorator(new User(1, '一级用户1', 1)));        $firstUser->add(new SecondLevelPopUsers(new UserDecorator(new User(2, '二级用户3', 2))));        $firstUser->add(new SecondLevelPopUsers(new UserDecorator(new User(3, '二级用户4', 2))));        $firstUser->add(new SecondLevelPopUsers(new UserDecorator(new User(4, '二级用户5', 2))));        $this->users[] = $firstUser;        $firstUser = new FirstLevelPopUsers(new UserDecorator(new User(6, '一级用户6', 1)));        $firstUser->add(new SecondLevelPopUsers(new UserDecorator(new User(7, '二级用户7', 2))));        $firstUser->add(new SecondLevelPopUsers(new UserDecorator(new User(8, '二级用户8', 2))));        $firstUser->add(new SecondLevelPopUsers(new UserDecorator(new User(9, '二级用户9', 2))));        $this->users[] = $firstUser;    }    public function current()    {        return current($this->users);    }    public function next()    {        $this->valid = (next($this->users) === false) ? false : true;    }    public function key()    {        return key($this->users);    }    public function valid()    {        return $this->valid;    }    public function rewind()    {        $this->valid = (reset($this->users) === false) ? false : true;    }}

　　

五.调用

$totalInfo = '';$html   =  '
     
      ';$popUserIterator = new PopUserIterator();foreach ($popUserIterator as $val) {    $html .= $val->display(1);}$html   .= '
';echo $html;

　　

输出: