使用PHP制作计算器

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<?php
/**
* Created by PhpStorm.
* User: admin
* Date: 2017/5/3
* Time: 0:55
*/
function add($x,$y){
return $x+$y;
}
function reduce($x,$y){
return $x-$y;
}
function times($x,$y){
return $x*$y;
}
function divide($x,$y){
return $x/$y;
}
$num1=$_GET['num1'];
$num2=$_GET['num2'];
$opt=isset($_GET['opt'])?$_GET['opt']:'add';
$a=$opt($num1,$num2);
?>

<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>计算器</title>
</head>
<body>
<form action="jisuanqi.php" method="get">
<input type="text" name="num1" value="<?php echo $num1 ?>"/>
<select name="opt">
<option value="add" <?php echo $opt=='add'?'selected':'' ?> >+</option>
<option value="reduce" <?php echo $opt=='reduce'?'selected':'' ?>>-</option>
<option value="times" <?php echo $opt=='times'?'selected':'' ?>>×</option>
<option value="divide" <?php echo $opt=='divide'?'selected':'' ?>>÷</option>
</select>
<input type="text" name="num2" value="<?php echo $num2 ?>"/>
=
<input type="text" name="num3" value="<?php echo $a ?>" />
<button>开始计算</button>
</form>
</body>
</html>

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