php 工厂模式

<body>
<?php

//设计模式：工厂模式
/*
class YunSuan
{
    public $a;
    public $b;
    
    
    function Jia()
    {
        return ($this->a+$this->b);
    }
    function Jian()
    {
        return ($this->a-$this->b);
    }
    function Cheng()
    {
        return ($this->a*$this->b);
    }
    function Chu()
    {
        return ($this->a/$this->b);
    }
    function Yu()
    {
        return ($this->a%$this->b);
    }
}

$y = new YunSuan();
$y->a = 10;
$y->b = 5;

echo $y->Jia();*/


//造父类，用子类继承
class YunSuan
{
    public $a;
    public $b;
    
    function YunSuan()
    {
    }
}

//加法的子类
class Jia extends YunSuan
{
    function YunSuan()
    {
        return ($this->a+$this->b);
    }
}

//减法的子类
class Jian extends YunSuan
{
    function YunSuan()
    {
        return ($this->a-$this->b);
    }
}

$y = new Jian();

$y->a = 10;
$y->b = 5;

//echo $y->YunSuan();

//再优化，工厂类

class GongChang
{
    
    static function DuiXiang($f)
    {
        switch($f)
        {
            case "+":
                return new Jia();
                break;
            case "-":
                return new Jian();
                break;
            case "*":
                return new Cheng();
                break;
        }
            
    }
}

$r = GongChang::DuiXiang("-");
$r->a=10;
$r->b = 5;
echo $r->YunSuan();



/*

class Suan
{
    public $total;
    
    function Jia($a)
    {
        $this->total = $this->total+$a;
        return $this->total;
    }
    function Jian($a)
    {
        $this->total = $this->total-$a;
    }
}*/




?>
</body>
</html>
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