html
<html>
<head>
<meta charset="UTF-8">
<title>简单计算器</title>
</head>
<body>
<h1>简单计算器</h1>
<form action="10.php" method="post">
<input type="text" name="v1" id="">
<select name="op" id="">
<option value="add">+</option>
<option value="reduce">-</option>
<option value="multi">*</option>
<option value="div">/</option>
</select>
<input type="text" name="v2" id="">
<button type="submit">结果</button>
</form>
</body>
</html>
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']);