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superglobals inside of function declarations

php.internals

Filip de Waard

22 years ago

Hello,

I've been using PHP for quite a while now and i'm getting interested
it's internal beheaviour. I'm wondering why it isn't possible to use a
global variable inside of a function declaration. For example:

<?
function refresh($location = $_SERVER['PHP_SELF'])
{
//refresh and load $location
}
//refreshes the page
refresh();
//redirects to another page
refresh("http://www.php.net/");
?>

Of course there are ways to circumvent this problem that have the same
result, but require more code. IMHO allowing globals inside of function
declarions will create interesting possibilities that could result in
more efficient code.

Regards,

Filip de Waard
Net Collective

www.netcollective.nl

Andi Gutmans

22 years ago

Hi,

In general you are only allowed to use scalars as default values. This
won't change.

I suggest you do something like:

function refresh($location = NULL) {
if ($location === NULL) {
$location = $_SERVER['PHP_SELF'];
}
}

At 11:26 AM 10/30/2003 +0100, Filip de Waard wrote:

Filip de Waard

22 years ago

Andy,

I know the current possibilities and limitations, but i'm wondering why
superglobals can't be used in function declarations. Is there a
particular reason for this?

Regards,

Filip de Waard

On Thu, 2003-10-30 at 11:35, Andi Gutmans wrote:

Derick Rethans

22 years ago

On Thu, 30 Oct 2003, Filip de Waard wrote:

> Andy,
>
> I know the current possibilities and limitations, but i'm wondering why
> superglobals can't be used in function declarations. Is there a
> particular reason for this?

Because PHP just only supports scalar constants there.

Derick

--
"Interpreting what the GPL actually means is a job best left to those
that read the future by examining animal entrails."
-------------------------------------------------------------------------
Derick Rethans                                 http://derickrethans.nl/
International PHP Magazine                          http://php-mag.net/
-------------------------------------------------------------------------

Kevin Waterson

22 years ago

This one time, at band camp, Derick Rethans <derick@php.net> wrote:

> On Thu, 30 Oct 2003, Filip de Waard wrote:
>
> > Andy,
> >
> > I know the current possibilities and limitations, but i'm wondering why
> > superglobals can't be used in function declarations. Is there a
> > particular reason for this?
>
> Because PHP just only supports scalar constants there.

why would you ever _want_ to?
The purpose of a super global is that it is available in all scopes.

Kevin

--
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Kevin Waterson
Port Macquarie, Australia