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(); "_blank" href="https://www.jb51.net/Special/43.htm">php面向对象程序设计入门教程》、《PHP数组(Array)操作技巧大全》、《PHP基本语法入门教程》、《PHP运算与运算符用法总结》、《php字符串(string)用法总结》、《php+mysql数据库操作入门教程》及《php常见数据库操作技巧汇总》希望本文所述对大家PHP程序设计有所帮助。
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PHP,设计模式,原型设计模式
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