getting results, but an error message as well.

[sp00ks]

I thought i figured out how to allow the user to insert a number, and then get php to call a function to figure out the radius of that number. I am getting the right number back, but also an error message. This tells me my structure of the code is incorrect.

If you know a better way to implement this that would be excellent. thanks!

 

Error:

Notice: Use of undefined constant radius - assumed 'radius' in C:\wamp\www\****.php on line 13

 

code:

<?php
//define a function
if(!isset($_POST['submit'])){

?>
<form action="<?php echo $_SERVER['PHP_SELF'];?>" method="post">
Enter the radius of the circle<input type="text" name="radius" size="5"/>
<input type="submit" name="submit" value="Go"/>
</form>

<?php
}else {
$rad = $_POST[radius];
getCircumference($rad);
}
function getCircumference ($radius){
echo"Circumference of a circle with radius $radius is ".sprintf("%4.2f", (2 * $radius * pi()))."<br />";
}
?>

[GKWelding]

Change

 

$rad = $_POST[radius];

 

to

 

$rad = $_POST["radius"];

 

and let me know if that helps.

[sp00ks]

Thanks that worked wonderfully. I guess if the input is going to be text(or anything) i have to call it as such. thanks for the quick answer!

 

EDIT: not sure how to mark my title as [solved]...