#41214 [Bgs]: referencing a reference parameter on a function-local variable does not work
| From: | php at warhog dot net | Date: | Fri, 27 Apr 2007 17:15:53 +0000 |
| Subject: | #41214 [Bgs]: referencing a reference parameter on a function-local variable does not work | ||
| References: | 1 | Groups: | php.bugs |
| Request: | Send a blank email to php-bugs+get-112011@lists.php.net to get a copy of this message | ||
ID: 41214
User updated by: php at warhog dot net
Reported By: php at warhog dot net
Status: Bogus
Bug Type: Variables related
Operating System: Linux (Ubuntu 6.10/Linux 2.6.17)
PHP Version: 5.2.1
New Comment:
Same thing in PHP 5.1.6 (from the official ubuntu repositories).
I thought about the problem and considered the fact that a local
variable vanishes when the function is done... so I tried the same
with a static variable.. but it didn't work either:
<?php
function some_function(&$foo)
{
static $_foo = NULL;
if (is_null($_foo)) {
$_foo = 1;
}
var_dump($_foo);
$foo =& $_foo;
var_dump($foo);
}
function some_other_function(&$foo)
{
$foo = 2;
}
function yet_another_function(&$foo)
{
$_foo = 3;
$foo =& $_foo;
var_dump($foo);
}
some_function($bar);
var_dump($bar);
some_other_function($bar);
var_dump($bar);
yet_another_function($bar);
var_dump($bar);
?>
Expected:
---------
int(1)
int(1)
int(1)
int(2)
int(3)
int(3)
Actual Result:
--------------
int(1)
int(1)
NULL
int(2)
int(3)
int(2)
Previous Comments:
------------------------------------------------------------------------
[2007-04-27 17:11:24] tony2001@php.net
You're creating a reference to the variable that exists only in the
function scope.
------------------------------------------------------------------------
[2007-04-27 17:04:28] php at warhog dot net
Description:
------------
When having a reference-variable as parameter in a function and
referencing it on a local variable (inside the function) the
variable will keep the referenced value inside the function but not
outside. That's not the way I understand references in PHP.
Reproduce code:
---------------
<?php
function yet_another_function(&$foo)
{
$_foo = 3;
$foo =& $_foo;
var_dump($foo);
}
yet_another_function($bar);
var_dump($bar);
?>
Expected result:
----------------
int(3)
int(3)
Actual result:
--------------
int(3)
NULL
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=41214&edit=1