A brief introduction to the three PHP factory modes

/**
 * 工厂模式
 */
//抽象产品
interface Person {
    public function getName(); 
}
//具体产品实现
class Teacher implements Person {
    function getName() {
        return "老师n";
    }
}
class Student implements Person {
    function getName() {
        return "学生n";
    }
}
//简单工厂
class SimpleFactory {
       public static function getPerson($type) {
              $person = null;
              if ($type == 'teacher') {
                     $person = new Teacher();
              } elseif ($type == 'student') {
                     $person = new Student();
              }
              return $person;
       }
}
//简单工厂调用
class SimpleClient {
       function main() {
              // 如果不用工厂模式，则需要提前指定具体类
              // $person = new Teacher();
              // echo $person->getName();
              // $person = new Student();
              // echo $person->getName();
              // 用工厂模式，则不需要知道对象由什么类产生，交给工厂去决定
              $person = SimpleFactory::getPerson('teacher');
              echo $person->getName();
              $person = SimpleFactory::getPerson('student');
              echo $person->getName();
       }
}
//工厂方法
interface CommFactory {
    public function getPerson();
}
//具体工厂实现
class StudentFactory implements CommFactory {
    function getPerson(){
        return new Student();
    }
}
class TeacherFactory implements CommFactory {
    function getPerson() {
        return new Teacher();
    }
}
//工厂方法调用
class CommClient {
    static function main() {
           $factory = new TeacherFactory();
           echo $factory->getPerson()->getName();
           $factory = new StudentFactory();
           echo $factory->getPerson()->getName();
    }
}
//抽象工厂模式另一条产品线
interface Grade {
       function getYear();
}
//另一条产品线的具体产品
class Grade1 implements Grade {
       public function getYear() {
              return '2003级';
       }
}
class Grade2 implements Grade {
       public function getYear() {
              return '2004级';
       }
}
//抽象工厂
interface AbstractFactory {
       function getPerson();
       function getGrade();
}
//具体工厂可以产生每个产品线的产品
class Grade1TeacherFactory implements AbstractFactory {
       public function getPerson() {
              return new Teacher();
       }
       public function getGrade() {
              return new Grade1();
       }
}
class Grade1StudentFactory implements AbstractFactory {
       public function getPerson() {
              return new Student();
       }
       public function getGrade() {
              return new Grade1();
       }
}
class Grade2TeacherFactory implements AbstractFactory {
       public function getPerson() {
              return new Teacher();
       }
       public function getGrade() {
              return new Grade2();
       }
}
//抽象工厂调用
class FactoryClient {
       function printInfo($factory) {
              echo $factory->getGrade()->getYear().$factory->getPerson()->getName();
       }
       function main() {
              $client = new FactoryClient();
              $factory = new Grade1TeacherFactory();
              $client->printInfo($factory);
              $factory = new Grade1StudentFactory();
              $client->printInfo($factory);
              $factory = new Grade2TeacherFactory();
              $client->printInfo($factory);
       }
}
//简单工厂
//SimpleClient::main();
//工厂方法
//CommClient::main();
//抽象工厂
FactoryClient::main();