PHP面向对象程序设计之对象生成方法详解

发布时间：2020-05-29 13:52:12 所属栏目：PHP 来源：互联网

导读：这篇文章主要介绍了PHP面向对象程序设计之对象生成方法,简单介绍了php常见对象生成模式并结合实例形式分析了php对象生成的单例模式、工厂模式、原形模式等概念与实现技巧,需要的朋友可以参考下

本文实例讲述了PHP面向对象程序设计之对象生成方法。分享给大家供大家参考，具体如下：

对象

看个例子

name = $name; } abstract function fire(); } class Minion extends Employee { // 奴隶继承雇员 function fire() { print "{$this->name}: I'll clear my deskn"; } } class NastyBoss { // 坏老板 private $employees = array(); function addEmployee( $employeeName ) { // 添加员工 $this->employees[] = new Minion( $employeeName ); // 代码灵活性受到限制 } function projectFails() { if ( count( $this->employees ) > 0 ) { $emp = array_pop( $this->employees ); $emp->fire(); // 炒鱿鱼 } } } $boss = new NastyBoss(); $boss->addEmployee( "harry" ); $boss->addEmployee( "bob" ); $boss->addEmployee( "mary" ); $boss->projectFails(); // output: // mary: I'll clear my desk ?>

再看一个更具有灵活性的案例

name = $name; } abstract function fire(); } class Minion extends Employee { function fire() { print "{$this->name}: I'll clear my deskn"; } } class NastyBoss { private $employees = array(); function addEmployee( Employee $employee ) { // 传入对象 $this->employees[] = $employee; } function projectFails() { if ( count( $this->employees ) ) { $emp = array_pop( $this->employees ); $emp->fire(); } } } // new Employee class... class CluedUp extends Employee { function fire() { print "{$this->name}: I'll call my lawyern"; } } $boss = new NastyBoss(); $boss->addEmployee( new Minion( "harry" ) ); // 直接以对象作为参数，更具有灵活性 $boss->addEmployee( new CluedUp( "bob" ) ); $boss->addEmployee( new Minion( "mary" ) ); $boss->projectFails(); $boss->projectFails(); $boss->projectFails(); // output: // mary: I'll clear my desk // bob: I'll call my lawyer // harry: I'll clear my desk ?>

单例

props[$key] = $val; } public function getProperty( $key ) { return $this->props[$key]; } } $pref = Preferences::getInstance(); $pref->setProperty( "name","matt" ); unset( $pref ); // remove the reference $pref2 = Preferences::getInstance(); print $pref2->getProperty( "name" ) ."n"; // demonstrate value is not lost ?>

点评：不能随意创建对象，只能通过Preferences::getInstance()来创建对象。

工厂模式

getApptEncoder(); // 获取对象 print $bloggs->encode(); ?>

output:

Appointment data encoded in BloggsCal format

进一步增加灵活性设置

mode = $mode; } function getHeaderText() { switch ( $this->mode ) { case ( self::MEGA ): return "MegaCal headern"; default: return "BloggsCal headern"; } } function getApptEncoder() { switch ( $this->mode ) { case ( self::MEGA ): return new MegaApptEncoder(); default: return new BloggsApptEncoder(); } } } $man = new CommsManager( CommsManager::MEGA ); print ( get_class( $man->getApptEncoder() ) )."n"; $man = new CommsManager( CommsManager::BLOGGS ); print ( get_class( $man->getApptEncoder() ) )."n"; ?>

output:

MegaApptEncoder BloggsApptEncoder

工厂方法模式要把创建者类与要生产的产品类分离开来。

抽象工厂

通过抽象来来约束，成为一定的规矩。

getHeaderText(); print $mgr->getApptEncoder()->encode(); // 对象调用方法，返回对象，继续调用方法。 print $mgr->getFooterText(); ?>

output:

MegaCal header Appointment data encoded in MegaCal format MegaCal footer

更加牛逼的实现

getHeaderText(); print $mgr->make( CommsManager::APPT )->encode(); print $mgr->getFooterText(); ?>

output:

BloggsCal header Appointment data encoded in BloggsCal format BloggsCal footer

原型模式

改造成一个保存具体产品的工厂类。

sea = $sea; $this->plains = $plains; $this->forest = $forest; } function getSea( ) { return clone $this->sea; // 克隆 } function getPlains( ) { return clone $this->plains; } function getForest( ) { return clone $this->forest; } } $factory = new TerrainFactory( new EarthSea(),new EarthPlains(),new EarthForest() ); print_r( $factory->getSea() ); print_r( $factory->getPlains() ); print_r( $factory->getForest() ); ?>

output:

更多关于PHP相关内容感兴趣的读者可查看本站专题：《》、《》、《》、《》、《》、《》、《》及《》

希望本文所述对大家PHP程序设计有所帮助。

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