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destructor access to constants

php.internals

Ulf Wendel

23 years ago

Hi,

I'm wondering if it's a bug to give automatically called destructors
access to constants (PHP Version 5.0.0b1). I'd expect to be neither able
to access global variables nor constants after script termination (die()).

Ulf


$dtor = 'global $dtor variable is visible';
define('DTOR', 'DTOR constant is visible');

class dtor {

function __destruct() {
global $dtor;
printf('$dtor = "%s"<br> DTOR = "%s"<br>', $dtor, DTOR);
}
}

$d1 = new dtor();
unset($d1);

$d2 = new dtor();
die();

generated output:

$dtor = "global $dtor variable is visible"
DTOR = "DTOR constant is visible"
$dtor = ""
DTOR = "DTOR constant is visible"

(Marcus Börger)

23 years ago

Hello Ulf,

Sunday, July 6, 2003, 12:27:00 PM, you wrote:

UW> Hi,

UW> I'm wondering if it's a bug to give automatically called destructors
UW> access to constants (PHP Version 5.0.0b1). I'd expect to be neither able
UW> to access global variables nor constants after script termination (die()).

UW> Ulf


UW> $dtor = 'global $dtor variable is visible';
UW> define('DTOR', 'DTOR constant is visible');

UW> class dtor {

UW>    function __destruct() {
UW>      global $dtor;
UW>      printf('$dtor = "%s"<br> DTOR = "%s"<br>', $dtor, DTOR);
UW>    }
UW> }

UW> $d1 = new dtor();
UW> unset($d1);

UW> $d2 = new dtor();
UW> die();

UW> generated output:

UW> $dtor = "global $dtor variable is visible"
UW> DTOR = "DTOR constant is visible"
UW> $dtor = ""
UW> DTOR = "DTOR constant is visible"



Global variables are a bit complicated but constants are either bound to the
class so they are obviously available in instance destruction or as in your
case they were registered in the global space and hence destructed after all
script action is finished which includes automatic destructor calls from GC.

--
Best regards,
Marcus                            mailto:helly@php.net

Ulf Wendel

23 years ago

Marcus Börger wrote:

> Global variables are a bit complicated but constants are either bound to the
> class so they are obviously available in instance destruction or as in your
> case they were registered in the global space and hence destructed after all
> script action is finished which includes automatic destructor calls from GC.

Hi Markus,

is the this behaviour a feature or a bug? With other words can I rely on
the following:

...
$__die = false;
die()
...

function __destruct() {
global $__die_called;

if (isset($__die))
// script is still running
print "... unless someone has unset $__die.";
else
// script has ended
print "that's it folks!";

}

Ulf