ID: 47173
User updated by: tommyhp2 at yahoo dot com
Reported By: tommyhp2 at yahoo dot com
Status: Bogus
Bug Type: Session related
Operating System: Win03 R2 SP2 PHP ISAPI
PHP Version: 5.2.8
New Comment:
I don't understand how is this bogus? I did look at the manual to make
sure I used the variable variables and reference correctly. Looking at
the code give, if I pass string 'arr' to the function, then $$var ==
${'arr'}. There is no ambiguity. If I do a var_dump($$var) equivalent
to var_dump(${'arr'}) inside the function right after global $$var, I
get the defined global $arr array contents. I didn't see any where in
the manual at
http://www.php.net/manual/en/language.variables.variable.php
about not being able to use it or implement it inside a function since
the examples didn't implement inside a function.
As for references, I don't think it's used improperly. Since I could
have multiple references to a single value:
$a = 'some string';
$b =& $a;
$c =& $a;
echo $b; // gives 'some string'
echo $c; // gives 'some string'
$a = 'nada';
echo $b; // gives 'nada'
which those 2 concepts, this code
$arr = array('idx1'=>'val1','idx2'=>'val2','idx3'=>'val3');
if (isset($_SESSION['arr']))
{
$arr =& $_SESSION['arr'];
} else {
$_SESSION =& $arr;
}
works as intended. If put the if/else inside a function and replace
with the appropriate variable along with global definition, why does it
break with no reference? Or is referencing not permitted inside a
function? Which I don't see in the manual. As for the example in the
manual of
function foo(&$var)
{
$var++;
}
I'm not passing the value or the pointer/reference. I'm passing a
string and using the string via variable variables and global and
referencing it as variable variables.
Thanks,
Tommy
Previous Comments:
------------------------------------------------------------------------
[2009-01-21 00:12:42] [email protected]
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php
Do not do that..
------------------------------------------------------------------------
[2009-01-20 19:32:22] tommyhp2 at yahoo dot com
Same problem w/ CVS PHP 5.2 - Windows x86 VC6 (thread safe)) [10.02MB]
- 2009-Jan-20 12:00:00
------------------------------------------------------------------------
[2009-01-20 19:27:31] tommyhp2 at yahoo dot com
Description:
------------
use of variable variables broken when reference inside a function in
conjunction with $_SESSION.
Thanks,
Tommy
Reproduce code:
---------------
Scenario 1:
<code>
session_start();
$arr = array('idx1'=>'val1','idx2'=>'val2','idx3'=>'val3');
if (isset($_SESSION['arr']))
{
$arr =& $_SESSION['arr'];
} else {
$_SESSION =& $arr;
}
</code>
Works as intended (please see "Expected result").
Scenario 2:
<code>
function register_session($var)
{
global $$var;
if (isset($_SESSION[$var]))
{
$$var =& $_SESSION[$var];
} else
{
$_SESSION[$var] =& $$var;
}
}
session_start();
$arr = array('idx1'=>'val1','idx2'=>'val2','idx3'=>'val3');
register_session('arr');
</code>
Does not work as intended (Please see "Actual result"). The variable
$arr is not referenced.
Expected result:
----------------
["_SESSION"]=>
&array(3) {
["idx1"]=>
string(4) "val1"
["idx2"]=>
string(4) "val2"
["idx3"]=>
string(4) "val3"
}
["arr"]=>
&array(3) {
["idx1"]=>
string(4) "val1"
["idx2"]=>
string(4) "val2"
["idx3"]=>
string(4) "val3"
}
Actual result:
--------------
["_SESSION"]=>
&array(1) {
["arr"]=>
array(3) {
["idx1"]=>
string(4) "val1"
["idx2"]=>
string(4) "val2"
["idx3"]=>
string(4) "val3"
}
}
["arr"]=>
array(3) {
["idx1"]=>
string(4) "val1"
["idx2"]=>
string(4) "val2"
["idx3"]=>
string(4) "val3"
}
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=47173&edit=1
