我的认为:所为工厂模式是事先有一系类class,一个工厂类'

工厂类根据不同的参数创建不同的对象,调用各自的方法;

php利用工厂模式实现计算器:

?php/** * Created by PhpStorm. * User: modern * Date: 16-7-19 * Time: 下午5:24 * 简单工厂模式两数运算器 */echo "hello factory models
";echo "begin
";if(isset($_GET['param1'])){    $param1 = $_GET['param1'];}else{    $param1 = 0;}if(isset($_GET['param2'])){    $param2 = $_GET['param2'];}else{    $param2 = 0;}if(isset($_GET['param3'])){    $param3 = $_GET['param3'];}else{    $param3 = '';}interface Init{    public function getResult($a,$b);}class OperateAdd implements Init{    public function getResult($a,$b)    {        return $a + $b;    }}class OperateSub implements Init{    public function getResult($a,$b)    {        return $a - $b;    }}class OperateMul implements Init{    public function getResult($a,$b)    {        return $a * $b;    }}class OperateDiv implements Init{    public function getResult($a,$b)    {        try{            if($b == 0){                throw new Exception("除数不能为0");            }else{                return $a / $b;            }        }catch (\Exception $e){            echo "运算发生错误:".$e->getMessage();        }    }}class Calc{    public static function operate($operate)    {        try{            switch($operate)            {                case '+':                    return new OperateAdd();break;                case '-':                    return new OperateSub();break;                case '*':                    return new OperateMul();break;                case '/':                    return new OperateDiv();break;                default:                    throw new Exception("标识错误!");        }        }catch (\Exception $e){            echo '运算错误:'.$e->getMessage();        }    }}$me = Calc::operate($param3);if(gettype($me) == 'object'){    $result = $me->getResult($param1,$param2);    echo $result;}

　

 

解说:本例中,定义接口类init,再定义加减乘除四个类分别实现这个接口类,这样每个运算方法都须事先方法getResult(),定义工厂类,工厂类里定义一个静态方法,用户根据不同参数创建各个方法对象.最后再调用getResult()实现运算.