Simple function not woking

Trancemission · Feb 24, 2003

I have a problem which is driving me mad and need some direction. I am trying to use my own functions. I have the following test code which I fail to get working on the following configs:

Apache + Php [4.3,4.2]
IIS + Php [4.3]

<?
function add($num1, $num2, $result=0)
{
$result = $num1 + $num2;
echo $result; <------ THIS WORKS!
return $result;
}
add(1,2);
echo $result;
?>
<html>
<head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>

<body>
<?
echo "<P>$result</P>";
?>
</body>
</html>

Surley this is simple code and should work? And I totally missing the point and do I need to rtfm? As you can see the $num2 + $num2 is working as it prints in the function.

I have tried not putting $result=0 in the function

Cheers
Trancemission
=============
If it's logical, it'll work!

skiflyer · Feb 24, 2003

It's a scoping issue... $result is ONLY set within your function... do this...

[red]function add($num1, $num2)[/red]

and

then when you call it

$result = add(1,2);

-Rob

BB101 · Feb 25, 2003

or if you want the 3rd parameter to hold your return do this:

function add($num1, $num2, &$result=0)
{
$result = $num1 + $num2;
echo $result; <------ THIS WORKS!
return $result;
}

so add(1,2,$res); $res will hold 3 --BB

skiflyer · Feb 25, 2003

Then there's no reason to return $result... if you want to pass by reference then...

function add($num1, $num2, &$res)
{
$res = $num1=$num2;
}

add(1,2,$result);

is sufficient.

-Rob

Trancemission · Feb 26, 2003

Many Thanks for the replies, all is working fine now.

As a note, I will be setting session variables in my function. Will this work? I have a login function and if successful will set a session variable.

Many THanks Trancemission
=============
If it's logical, it'll work!

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Simple function not woking

Trancemission

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skiflyer

Programmer

BB101

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skiflyer

Programmer

Trancemission

Technical User

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