I want to calculate the sum of two numbers with php. but..........

Question

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I want to calculate the sum of two numbers with php.
But my code can't do that.
Can somebody help me ? I'm a beginner .

XML

<!doctype html>
<html>
<head>

    <title>question2</title>
<head>

<body>
<?php
$num1=_$POST["num1"];
$num2=_$POST["num2"];
$result=$num1+$num2;
?>

<form action="test.htm" method="post" name="myform" align="center">
Enter number 1:<input type="text" name="num1" />
<br>
Enter number 2:<input type="text" name="num2" />
<br>
<input type="submit" name="result" />
</form>
<hr>

<table border='1' align='center'>

<td>number 1</td><td>calculate</td><td>number 2</td><td>result</td>
<tr>
<td>
<? echo  $num1; ?>
</td>
<td>+</td>
<td>
<? echo  $num2; ?>
</td>
<td>
<? echo  $result; ?> </td>

</table>

</body>
</html>

Posted 12-Aug-12 4:28am

陳建勳

Updated 7-Aug-18 20:00pm

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3 solutions

Solution 3

The soulution to your problem is as follows:

HTML

<html>
<head>
    <title>question2</title>
<head>
<body>
if(isset($_POST['num1'])){
   $num1 = $_POST['num1'];
   $num2 = $_POST['num2'];
   $result = $num1 + $num2;
}
?>
<form action="<?=$_SERVER['PHP_SELF']?>" method="post" name="myform" align="center">
Enter number 1:<input type="text" name="num1" />
<br />
Enter number 2:<input type="text" name="num2" />
<br />
<input type="submit" name="result" />
</form>
<hr />

<table border="1" align="left"> 
	<tr><td align="center">number 1</td><td align="center">calculate</td><td align="center">number 2</td><td align="center">result</td></tr>
	<tr><td align="center"></td><td align="center">+</td><td align="center"></td><td align="center"></td></tr>
</table>
<?php } ??>

</head></head></html>

Have fun!!!

Posted 12-Aug-12 19:08pm

Patrick Wanjau

Comments

陳建勳 13-Aug-12 9:45am

Hello,Patrick Wanjau!
I have a little problem.
SERVER['PHP_SELF']
what is its effect ?

Patrick Wanjau 13-Aug-12 9:51am

It redirects to the same url. For example, if you have www.site.com, it will redirect to www.site.com, if you have www.site.com/index.php - redirect to www.site.com/index.php...etc

Solution 2

I don't know what happen.
but the problem have been solved by itself in today's morning!!
Perhaps associated with server Maintenance.

Posted 12-Aug-12 18:09pm

陳建勳

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André Kraak · Accepted Answer · 2012-08-12T05:48:00

Solution 1

I never done anything with PHP, but the code in this post How to add two numbers using PHP[^] looks like it might be helpful.

Posted 12-Aug-12 5:48am

André Kraak

Comments

陳建勳 12-Aug-12 13:04pm

thank you ! This is so helpful.

but I found a new problem!!!...
My code is correct but it can't be executed by my browser.
only showed off the part of HTML .

enhzflep 12-Aug-12 14:39pm

The thing with PHP is, it ISN'T executed in your browser, but rather in the server - it's a Server Side language.
You'll need to install a webserver to use this code.

I recommend XAMPP - It's free, cross-platform and works.

陳建勳 13-Aug-12 0:02am

Thank you
I have installed the Appserv v2.5.10,so it is not cause of the problem,
and it's bizarre! problem was solved by itself in today's morning!!

enhzflep 13-Aug-12 0:09am

You're welcome. Great! Glad it works now.
Strange problem...