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PHP设计模式之原型设计模式原理与用法分析

2024-05-05 00:03:23
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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:

<?php/***  原型设计模式*        以现代企业组织为例**///部门抽象类abstract class IAcmePrototype{  protected $id;   //员工ID号  protected $name;  //员工名字  protected $dept;  //员工部门  //克隆方法  abstract function __clone();  //员工部门设置方法  abstract function setDept($orgCode);  //员工部门获取方法  public function getDept()  {    return $this->dept;  }  //员工ID号设置方法  public function setId($id)  {    $this->id = $id;  }  //员工ID号获取方法  public function getId()  {    return $this->id;  }  //员工名字设置方法  public function setName($name)  {    $this->name = $name;  }  //员工名字获取方法  public function getName()  {    return $this->name;  }}//市场部类class Marketing extends IAcmePrototype{  const UNIT = "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();?>

运行结果:

Tess Smith
sales
ts101-1234
Jacob Jones
promotion
jj101-2234
Ricky Rodrigues
operations
rr203-5634
Olivia perez
digital artwork
op302-1278
John Jackson
programming
jj301-1454

希望本文所述对大家PHP程序设计有所帮助。


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