简单工厂模式

代码示例：

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//产品抽象基类 abstract class ApptEncoder {     abstract public function encode(); } //产品子类1 class BloggsApptEncoder extends ApptEncoder {     public function encode()     {         return "Appointment data encode in BloggsCal format\n";     } } //产品子类2 class MegaApptEncoder extends ApptEncoder {     public function encode()     {         return "Appointment data encode in MegaCal format\n";     } }   //创建者 class CommsManager {     public function getApptEncoder($type)     {         switch($type)         {             case 'Bloggs':                 return new BloggsApptEncoder();             case 'Mega':                 return new MegaApptEncoder();         }               } }   $manager = new CommsManager(); //生成产品子类1对象 $encoder1 = $manager->getApptEncoder('Bloggs'); echo $encoder1->encode(); //生成产品子类2对象 $encoder2 = $manager->getApptEncoder('Mega'); echo $encoder2->encode();