(编辑：jimmy 日期: 2024/10/3 浏览：2)
本文实例讲述了PHP设计模式之原型设计模式原理与用法。分享给大家供大家参考，具体如下：
一、什么是原型设计模式
原型设计模式使用一种克隆技术来复制实例化的对象，新对象是通过复制原型实例创建的。原型设计模式的目的是通过使用克隆以减少
实例化对象的开销。
在原型设计模式中，Client类是不可缺少的一部分。
PHP有一个内置的克隆方法__clone()可以在设计模式中使用，但是不能直接访问，使用clone关键字即可。克隆不会启动构造函数。
二、什么时候使用原型设计模式
如果一个项目要求你创建某个原型对象的多个实例，就可以使用原型设计模式。
三、原型设计模式实例
这里以现代企业组织为例：
<"Marketing"; //标识
//市场部门类别
private $sales = "sales";
private $promotion = "promotion";
private $strategic = "strategic planning";
//克隆函数
function __clone()
{
}
//部门设置函数
public function setDept($orgCode)
{
switch($orgCode)
{
case 101:
$this->dept = $this->sales;
break;
case 102:
$this->dept = $this->promotion;
break;
case 103:
$this->dept = $this->strategic;
break;
default:
$this->dept = "Unrecognized Marketing";
}
}
}
//管理部类
class Management extends IAcmePrototype
{
const UNIT = "Management";
private $research = "research";
private $plan = "planning";
private $operations = "operations";
function __clone()
{
}
public function setDept($orgCode)
{
switch($orgCode)
{
case 201:
$this->dept = $this->research;
break;
case 202:
$this->dept = $this->plan;
break;
case 203:
$this->dept = $this->operations;
break;
default:
$this->dept = "Unrecognized Marketing";
}
}
}
//工厂部类
class Engineering extends IAcmePrototype
{
const UNIT = "Engineering";
private $development = "programming";
private $design = "digital artwork";
private $sysAd = "system administration";
function __clone()
{
}
public function setDept($orgCode)
{
switch($orgCode)
{
case 301:
$this->dept = $this->development;
break;
case 302:
$this->dept = $this->design;
break;
case 303:
$this->dept = $this->sysAd;
break;
default:
$this->dept = "Unrecognized Marketing";
}
}
}
//客户类
class Client
{
private $market; //市场部类实例
private $manage; //管理部类实例
private $engineer; //工厂部类实例
//构造函数
public function __construct()
{
$this->makeConProto();
//市场部类实例克隆
$Tess = clone $this->market;
$this->setEmployee($Tess,"Tess Smith",101,"ts101-1234");
$this->showEmployee($Tess);
$Jacob = clone $this->market;
$this->setEmployee($Jacob,"Jacob Jones",102,"jj101-2234");
$this->showEmployee($Jacob);
//管理部类实例克隆
$Ricky = clone $this->manage;
$this->setEmployee($Ricky,"Ricky Rodrigues",203,"rr203-5634");
$this->showEmployee($Ricky);
//工程部类实例克隆
$Olivia = clone $this->engineer;
$this->setEmployee($Olivia,"Olivia perez",302,"op302-1278");
$this->showEmployee($Olivia);
$John = clone $this->engineer;
$this->setEmployee($John,"John Jackson",301,"jj301-1454");
$this->showEmployee($John);
}
//实例化部门对象
private function makeConProto()
{
$this->market = new Marketing();
$this->manage = new Management();
$this->engineer = new Engineering();
}
//员工信息设置方法
private function setEmployee(IAcmePrototype $employee,$name,$dept,$id)
{
$employee->setName($name);
$employee->setDept($dept);
$employee->setId($id);
}
//员工信息显示方法
private function showEmployee(IAcmePrototype $employee)
{
echo $employee->getName() . '<br />';
echo $employee->getDept() . '<br />';
echo $employee->getId() . '<br />';
}
}
$client = new Client();
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