php设计模式之策略模式实例代码

html

    "UTF-8">
    



简单计算器
    
"10.php" method="post">
        "text" name="v1" id="">
        <select name="op" id="">
            "add">+
            "reduce">-
            "multi">*
            "div">/
        select>
        "text" name="v2" id="">
        "submit">结果
    

php

php 
header("Content-type:text/html;charset=utf-8");

interface math{
    function cal($v1, $v2);
}

class mathadd implements math
{
    public function cal($v1, $v2){
        return $v1 + $v2;
    }
}

class mathreduce implements math
{
    public function cal($v1, $v2){
        return $v1 - $v2;
    }
}

class mathmulti implements math
{
    public function cal($v1, $v2){
        return $v1 * $v2;
    }
}

class mathdiv implements math
{
    public function cal($v1, $v2){
        return $v1 / $v2;
    }
}

/**
* 
*/
class Cmath 
{
    protected $type;
    protected $calc = null;
    function __construct($type)
    {
        $this->type = $type;
        $cal = 'math'.$type;
        $this->calc = new $cal();

    }
    public function cal($v1, $v2){
        return $this->calc->cal($v1, $v2);
    }

}

$op = $_POST['op'];
$cal = new Cmath($op);
echo $cal->cal($_POST['v1'], $_POST['v2']);