面向對象程序的設計模式-工廠模式

CommManager 類中的 getApptEncoder() 方法 專門用來負責生成相應的對象。

如下代碼來自《深刻PHP 面向對象、模式與實踐》（第三版）第9章

<?php/** * Created by PhpStorm. * User: Eilen * Date: 2018/9/2 * Time: 8:40 */abstract class ApptEncoder{    abstract function encode();}class BloggsApptEncoder extends ApptEncoder{    public function encode()    {        return 'Appointment data encoded in BloggsCal format\n';    }}class MegaApptEncoder extends ApptEncoder{    public function encode()    {        return 'Appointment data encoded in MegaCal format\n';    }}class CommManager{    const BLOGGS = 1;    const MEGA =2;    private $mode;    function __construct($mode)    {        $this->mode = $mode;    }    function getHeaderText()    {        switch ($this->mode){            case (self::MEGA):                return 'MegaCal header\n';            default:                return 'BloggsCal header\n';        }    }    function getApptEncoder()    {        switch ($this->mode){            case (self::MEGA):                return new MegaApptEncoder();            default:                return new BloggsApptEncoder();        }    }}//引用工廠模式$comm = new CommManager(CommManager::MEGA);$mega = $comm->getApptEncoder();echo $mega->encode();