这个小程序有什么问题。变量$ sum不会在屏幕上打印出来 [英] What is wrong in this small program. The variable $sum is not printed out on the screen

问题描述

Enter First Number:  
<br><br>  
Enter Second Number:  
<br><br>  
  


  
<?php  
    if(isset($_POST['submit']))  
    {  
        $number1 = $_POST['number1'];  
        $number2 = $_POST['number2'];  
        $sum =  $number1+$number2;     
echo "The sum of $number1 and $number2 is: ".$sum;   
}  
?>

< b>我尝试了什么：



我能想到的一切。我在xampp中尝试了它，但在屏幕上没有输出。

What I have tried:

Everything i could think of. I tryed it in xampp but get no output on the screen.

推荐答案

_POST [' 提交']））
{

_POST['submit'])) {

number1 =

number1 =

_POST [' number1'];

_POST['number1'];

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