放假

预习了一点PHP的知识,感觉自己的装的集成环境好像有点问题啊,表单的数据提交给php文件之后不能正常翻译,网页把php代码全翻译出来的,真是一脸懵逼啊...

<?php
//可变变量
$a1 = 3;
$a2 = 89;
$a3 = 32;
$a4 = 54;
$a5 = 34;
$sum = 0;
for($i=1; $i<=5; $i++){
    $a = "a" . $i;
    $sum += $$a;
}
echo $sum;
?>

 不知咋地,我的浏览器又正常了,就把这个计算器做了一下,自己瞎写的,结果显示还算正常,就是不知有没有什么写法上的问题,明天再看老师的方法.

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>计算器</title>
</head>
<body>
<?php
$res = "";
$num1 = "";
$num2 ="";
$yunsuanfu = "";
if(!empty($_POST)){
    $num1 = $_POST['num1'];
    $num2 = $_POST['num2'];
    $yunsuanfu = $_POST['method'];
    switch($yunsuanfu){
        case "+":
            $res = $num1 + $num2;
            break;
        case "-":
            $res = $num1 - $num2;
            break;
        case "*":
            $res = $num1 * $num2;
            break;
        default:
            $res = $num1 / $num2;
            break;
    }
}
    
?>    

<form method="post">
<input type="text" name="num1" value="<?php echo $num1; ?>">
<select name="method">
    <option value="+" <?php if($yunsuanfu=="+"){echo "selected=selected";} ?> >+</option>
    <option value="-" <?php if($yunsuanfu=="-"){echo "selected=selected";} ?> >-</option>
    <option value="*" <?php if($yunsuanfu=="*"){echo "selected=selected";} ?> >*</option>
    <option value="/" <?php if($yunsuanfu=="/"){echo "selected=selected";} ?> >/</option>
</select>
<input type="text" name="num2" value="<?php echo $num2; ?>">
<input type="submit" value="=">
<input type="text"  value="<?php echo $res; ?>" >
</form>

</body>
</html>

 

posted @ 2016-12-17 23:09  panbee  阅读(95)  评论(0)    收藏  举报