vb.org Archive - Passing by reference

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- - Passing by reference (https://vborg.vbsupport.ru/showthread.php?t=61797)

filburt1

02-22-2004 07:59 PM

Passing by reference

http://www.php.net/manual/en/languag...nces.unset.php

So, what if I want to destroy the variable that was passed to a function?

PHP Code:


		
			
function executeFilterAction(&$message, $filter)

    {

        $subject = htmlspecialchars_uni($message['subject']);

        

        switch ($filter['tofolderid'])

        {

            case VBMS_FILTER_TOFOLDERID_DELETE:

                debugecho("Message &quot;$subject&quot; will be deleted");

                unset($message);

                break;

                

            case VBMS_FILTER_TOFOLDERID_MARKASREAD:

                debugecho("Message &quot;$subject&quot; will be marked as read");

                $message['readflag'] = true;

                break;

                

            default:

                debugecho("Message &quot;$subject&quot; will be moved to folderid " .

                        $filter['tofolderid']);

                $message['folderid'] = $filter['tofolderid'];

                break;

        }

        

        return false;

    }

Note that VBMS_FILTER_TOFOLDER_DELETE case and what it does.

filburt1

02-24-2004 12:26 AM

Nobody has an idea on this...

Velocd

02-24-2004 04:07 PM

PHP Code:


		
			
    $a = 5;

    $b =& $a;



    echo $a;

    echo '<br />';

    echo $b;



    unset($a);



    echo $a;

    echo '<br />';

    echo $b;

Returns:

Code:

With $a eliminated.

PHP Code:


		
			
    $a = 5;

    $b =& $a;



    echo $a;

    echo '<br />';

    echo $b;



    $a = '';



    echo $a;

    echo '<br />';

    echo $b;

Returns:

Code:

5

5

Some kind of PHP quirk perhaps.

filburt1

02-24-2004 04:16 PM

Note that it is in a function.

Velocd

02-24-2004 04:38 PM

Quote:

Originally Posted by filburt1

Note that it is in a function.

Yes, I noted. It isn't possible then, since any variable outside of a function is out of scope unless it's a global.

Maybe calling another function and unsetting the variable, or if it was part of a class unset its member variable of the object.

[high]* Velocd shrugs[/high]

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