html：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>策略模式</title>
</head>
<body>
<form action='./demo03.php' method="post">
<input type="text" name="op1">
<select name="op">
<option value="Add">+</option>
<option value="Sub">-</option>
<option value="Multi">*</option>
<option value="div">/</option>
</select>
<input type="text" name="op2">
<p><input type="submit" name="" value="计算"></p>
</form>
</body>
</html>
PHP:
<?php
/**
* 策略模式
*
* 实现加减乘除
*/
interface MathOp
{
public function calculation(float $num1, float $num2);
}
//策略一 加
class MathAdd implements MathOp
{
public function calculation(float $num1, float $num2)
{
// TODO: Implement calculation() method.
return $num1+$num2;
}
}
//策略二 减
class MathSub implements MathOp
{
public function calculation(float $num1, float $num2)
{
// TODO: Implement calculation() method.
return $num1-$num2;
}
}
//策略三 乘
class MathMulti implements MathOp
{
public function calculation(float $num1, float $num2)
{
// TODO: Implement calculation() method.
return $num1*$num2;
}
}
class MathDiv implements MathOp
{
public function calculation(float $num1, float $num2)
{
// TODO: Implement calculation() method.
if( $num2 == 0) {
return "被除数不能为0";
}
return $num1/$num2;
}
}
//环境角色 选择策略实现
class op
{
private $mathop;
public function __construct(string $type)
{
$this->mathop = 'Math'.$type;
}
public function calc (float $num1, float $num2)
{
$cls = new $this->mathop;
echo $cls->calculation($num1, $num2);
}
}
$type = $_POST['op'];
$op1 = $_POST['op1'];
$op2 = $_POST['op2'];
$obj = new op($type);
$obj->calc($op1, $op2);