PHP简单计算器
[英]Php simple calculator
问题描述
i am a beginner in php ,i am trying to do a calculator but something is wrong .i don´t know what is it .when i click the butoon submit the fields turn empty . 
我是php的初学者，我正在尝试做一个计算器，但是出了点问题。我不知道这是什么。当我单击按钮时，将字段变为空。
<head>
<title>Funcion isset()</title>
</head>
<body>
<form name="forma" method="post">
Realitza una operacio: <br> <br/>
<input type="text" name="num1"> </t> Operador 1 <br /></br/>
<input type="text" name="num2"> </t> Operador 2 <br /></br>
Operació:</br></br>
<input type="radio" name="opcion" value="+">Suma <br /></br/>
<input type="radio" name="opcion" value="-">Resta <br /></br/>
<input type="radio" name="opcion" value="*">Multiplicacio <br /></br/>
<input type="radio" name="opcion" value="/">Divisio <br /></br/>
<input type="radio" name="opcion" value="p">Potencia <br /></br/>
<input type="submit" name "submit" value="Calcular">
</form>
<?php
if (isset($_POST['calcular']))
{
$n1 = $_POST['numero1'];
$n2 = $_POST['numero2'];
$oper = $_POST['opcion'];
switch ($oper) {
case "+":echo $n1 + $n2;break;
case "-": echo $n1 - $n2; break;
case "*": echo $n1 * $n2;break;
case "/":echo $n1 / $n2;break;
case "p": echo pow( $n1,$n2);break;
}
}
?>
</body>
</html>
any help would be appreciated . 任何帮助，将不胜感激 。
1 个解决方案
解决方案1
0 2014-10-13 22:25:23
There are two obvious problems here: 这里有两个明显的问题：
Instead of
<input type="submit" name "submit" value="Calcular">you have to fix the syntax:name="submit"代替<input type="submit" name "submit" value="Calcular">您必须修复语法：name="submit"And you have to check for a post variable with name "submit":
if (isset($_POST['submit']))并且您必须检查名称为“ submit”的发布变量： if (isset($_POST['submit']))
In general, to debug such problem is is always the first check to really look what values you are actually working with. 通常，调试此类问题始终是真正了解您实际使用的值的第一个检查。 In this case this means: what is actually continaed in $_POST ? 在这种情况下，这意味着： $_POST实际上是什么？ So the first step would be to dump that array using var_dump($_POST); 因此，第一步将是使用var_dump($_POST);转储该数组var_dump($_POST); or similar. 或类似。
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