Question

我想在PHP中添加用户数据的减法和其他功能。首先，我想检查字段是否为空。当我使用empty()函数检查空并且我提交零然后它显示需要这意味着它是空的。如何输入零并添加或减去我的第二个值？谢谢。我的代码在这里

<html>
<head>

</head>
<body>
<?php
if ($_SERVER['REQUEST_METHOD']=='POST'){
    $num1=$_POST['num1'];
    $num2=$_POST['num2'];
    if (empty($num1 AND $num2)){
        echo "Required";
    }else{
    if ($_POST['submit']=='Add'){
        $num1=$_POST['num1'];
        $num2=$_POST['num2'];
        $add=$num1+$num2;
        echo $add;
    }
    elseif ($_POST['submit']=='Subtract'){
        $subtract=$num1-$num2;
        echo $subtract;
    }
    elseif ($_POST['submit']=='Multiplication'){
        $multiply=$num1*$num2;
        echo $multiply;
    }
    elseif ($_POST['submit']=='Division'){
        $division=$num1/$num2;
        echo $division;
    }

    }
}
?>

<form action="" method="post">
    <input type="number" name="num1">
    <input type="number" name="num2">
    <input type="submit" name="submit" value="Add">
    <input type="submit" name="submit" value="Subtract">
    <input type="submit" name="submit" value="Multiplication">
    <input type="submit" name="submit" value="Division">
</form> 

</body>
</html

Answer 1

更改此行

 if (empty($num1 AND $num2)){}

到

if (isset($num1) && isset($num2)  && $num1>=0 && $num2>=0){}// this will show warning if $num1 or $num2 is not set

或

if (!empty($num1) && !empty($num2)  && $num1>=0 && $num2>=0){}// this will not show warnings

empty会将0视为空，但如果$ num1或$ num2未设置，则不会显示任何错误

Answer 2

确定

让我们使用v Sugumar的答案，让它变得更容易：

function emp($value){
if (isset($value) && $value>=0 ){
   return true;//has value
}else{
   return false;//empty
}

现在你只需要使用它：

if(emp($num1) and emp($num2)){
    //You typed a value, do something
}

在PHP上检查Empty和zero

2 个答案:

确定