Bug #47623 [Com]: array_shift() fails with @ operator
Edit report at http://bugs.php.net/bug.php?id=47623edit=1
ID: 47623
Comment by: laruence at yahoo dot com dot cn
Reported by: Henry at huis-stijl dot nl
Summary: array_shift() fails with @ operator
Status: Verified
Type: Bug
Package: Scripting Engine problem
Operating System: *
PHP Version: 5.*, 6CVS (2009-04-30)
New Comment:
errata:
//then in zend_do_pass_param:
ZEND_SEND_VAR gen opcode:SEND_REF, ZEND_SEND_VAL gen
opcode:SEND_VAR_NO_REF
Previous Comments:
[2010-05-28 16:35:20] laruence at yahoo dot com dot cn
Hi, I found the same bug in php 5.2.8(linux)
and I also find out why:
in php complie phase,
@$var - expr_without_variable;
//code
expr_without_variable:
...
| '@' { zend_do_begin_silence($1 TSRMLS_CC); }
expr { zend_do_end_silence($1 TSRMLS_CC); $$ = $3; }
while:
$var - variable
then this different cause the znode's difference
//
non_empty_function_call_parameter_list:
expr_without_variable { Z_LVAL($$.u.constant) = 1;
zend_do_pass_param($1, ZEND_SEND_VAL, Z_LVAL($$.u.constant) TSRMLS_CC);
}
| variable{ Z_LVAL($$.u.constant) = 1;
zend_do_pass_param($1, ZEND_SEND_VAR, Z_LVAL($$.u.constant) TSRMLS_CC);
}
then in zend_so_pass_param:
ZEND_SEND_VAR gen opcode:SEND_REF, ZEND_SEND_VAR gen
opcode:SEND_VAR_NO_REF
so when use @, cause param send without ref.
you can find more info on : http://www.laruence.com/2010/05/28/1565.html
[2010-05-05 20:56:31] whatrevolution at yahoo dot com
?php
$_SESSION['villas'] = array
(
1 = array(1,2,3),
2 = array(2,3,4),
3 = array(3,4,5),
4 = array(4,5,6),
);
/*
* ONE:
*/
/*
While(@$_SESSION['villas'] != array())
{
$row = array_shift(@$_SESSION['villas']);
print_r($row);
}// einde while
*/
/*
* TWO:
*/
/*
while($foo['villas'] != array())
{
$row = array_shift(@$foo['villas']); // Removing @ makes it work..
var_dump($foo);
}
*/
/*
* THREE:
*/
//I cann bypass this failure by using:
$arr_temp = @$_SESSION['villas'];
$row = array_shift($arr_temp);
$_SESSION['villas'] = $arr_temp;
unset($arr_temp);
var_dump($_SESSION['villas']);
?
Result:
One and Two, same as described before.
Three:
array
0 =
array
0 = int 2
1 = int 3
2 = int 4
1 =
array
0 = int 3
1 = int 4
2 = int 5
2 =
array
0 = int 4
1 = int 5
2 = int 6
PHP Version 5.2.10-2ubuntu6.4
System Linux 2.6.31-20-generic x86_64
Build Date Jan 6 2010 22:36:47
Server API Apache 2.0 Handler
PHP API 20041225
PHP Extension 20060613
Zend Extension 220060519
Debug Build no
Thread Safety disabled
Zend Memory Manager enabled
Apache/2.2.12 (Ubuntu)
[2009-04-13 18:23:01] j...@php.net
This has nothing to do with sessions. Simplified script:
?php
$foo['villas'] = array('a','b','c');
while($foo['villas'] != array())
{
$row = array_shift(@$foo['villas']); // Removing @ makes it work..
var_dump($foo);
}
?
[2009-03-16 22:11:28] Henry at huis-stijl dot nl
Tried with and without the @ same output.
[2009-03-16 16:26:07] j...@php.net
If you remove those @'s, what does it output..?
The remainder of the comments for this report are too long. To view
the rest of the comments, please view the bug report online at
http://bugs.php.net/bug.php?id=47623
--
Edit this bug report at http://bugs.php.net/bug.php?id=47623edit=1
Bug #47623 [Com]: array_shift() fails with @ operator
Edit report at http://bugs.php.net/bug.php?id=47623edit=1
ID: 47623
Comment by: laruence at yahoo dot com dot cn
Reported by: Henry at huis-stijl dot nl
Summary: array_shift() fails with @ operator
Status: Verified
Type: Bug
Package: Scripting Engine problem
Operating System: *
PHP Version: 5.*, 6CVS (2009-04-30)
New Comment:
Hi, I found the same bug in php 5.2.8(linux)
and I also find out why:
in php complie phase,
@$var - expr_without_variable;
//code
expr_without_variable:
...
| '@' { zend_do_begin_silence($1 TSRMLS_CC); }
expr { zend_do_end_silence($1 TSRMLS_CC); $$ = $3; }
while:
$var - variable
then this different cause the znode's difference
//
non_empty_function_call_parameter_list:
expr_without_variable { Z_LVAL($$.u.constant) = 1;
zend_do_pass_param($1, ZEND_SEND_VAL, Z_LVAL($$.u.constant) TSRMLS_CC);
}
| variable{ Z_LVAL($$.u.constant) = 1;
zend_do_pass_param($1, ZEND_SEND_VAR, Z_LVAL($$.u.constant) TSRMLS_CC);
}
then in zend_so_pass_param:
ZEND_SEND_VAR gen opcode:SEND_REF, ZEND_SEND_VAR gen
opcode:SEND_VAR_NO_REF
so when use @, cause param send without ref.
you can find more info on : http://www.laruence.com/2010/05/28/1565.html
Previous Comments:
[2010-05-05 20:56:31] whatrevolution at yahoo dot com
?php
$_SESSION['villas'] = array
(
1 = array(1,2,3),
2 = array(2,3,4),
3 = array(3,4,5),
4 = array(4,5,6),
);
/*
* ONE:
*/
/*
While(@$_SESSION['villas'] != array())
{
$row = array_shift(@$_SESSION['villas']);
print_r($row);
}// einde while
*/
/*
* TWO:
*/
/*
while($foo['villas'] != array())
{
$row = array_shift(@$foo['villas']); // Removing @ makes it work..
var_dump($foo);
}
*/
/*
* THREE:
*/
//I cann bypass this failure by using:
$arr_temp = @$_SESSION['villas'];
$row = array_shift($arr_temp);
$_SESSION['villas'] = $arr_temp;
unset($arr_temp);
var_dump($_SESSION['villas']);
?
Result:
One and Two, same as described before.
Three:
array
0 =
array
0 = int 2
1 = int 3
2 = int 4
1 =
array
0 = int 3
1 = int 4
2 = int 5
2 =
array
0 = int 4
1 = int 5
2 = int 6
PHP Version 5.2.10-2ubuntu6.4
System Linux 2.6.31-20-generic x86_64
Build Date Jan 6 2010 22:36:47
Server API Apache 2.0 Handler
PHP API 20041225
PHP Extension 20060613
Zend Extension 220060519
Debug Build no
Thread Safety disabled
Zend Memory Manager enabled
Apache/2.2.12 (Ubuntu)
[2009-04-13 18:23:01] j...@php.net
This has nothing to do with sessions. Simplified script:
?php
$foo['villas'] = array('a','b','c');
while($foo['villas'] != array())
{
$row = array_shift(@$foo['villas']); // Removing @ makes it work..
var_dump($foo);
}
?
[2009-03-16 22:11:28] Henry at huis-stijl dot nl
Tried with and without the @ same output.
[2009-03-16 16:26:07] j...@php.net
If you remove those @'s, what does it output..?
[2009-03-11 14:07:22] Henry at huis-stijl dot nl
?php
session_start();
ini_set('session.cache_limiter', 'private');
// © 2009 Huis-stijl, Henry Hekman
$_SESSION['villas'] = array
(
1 = array(1,2,3),
2 = array(2,3,4),
3 = array(3,4,5),
4 = array(4,5,6),
);
While(@$_SESSION['villas'] != array())
{
$row = array_shift(@$_SESSION['villas']);
print_r($row);
}// einde while
?
on php 4 i get
Array ( [0] = 1 [1] = 2 [2] = 3 ) Array ( [0] = 2 [1] = 3 [2] = 4
) Array ( [0] = 3 [1] = 4 [2] = 5 ) Array ( [0] = 4 [1] = 5 [2] =
6 )
on phph 5.2.9 i get a loop that doesnt end
Array ( [0] = 1 [1] = 2 [2] = 3 ) Array ( [0] = 1 [1] = 2 [2] = 3
) Array ( [0] = 1 [1] = 2 [2] = 3 ) Array ( [0] = 1 [1] = 2 [2] =
3 ) Array ( [0] = 1 [1] = 2 [2] = 3 ) Array ( [0] = 1 [1] = 2 [2]
= 3 ) Array ( [0] = 1 [1] = 2 [2] = 3 ) Array ( [0] = 1 [1] = 2
[2] = 3 ) Array ( [0] = 1 [1] = 2 [2] = 3 ) Array ( [0] = 1 [1] =
2 [2] = 3 ) Array ( [0] = 1 [1] = 2 [2] = 3 ) Array ( [0] = 1 [1]
= 2 [2] = 3 ) Array ( [0] = 1 [1] = 2 [2] = 3 )
The remainder of the comments for this
Bug #47623 [Com]: array_shift() fails with @ operator
Edit report at http://bugs.php.net/bug.php?id=47623edit=1
ID: 47623
Comment by: whatrevolution at yahoo dot com
Reported by: Henry at huis-stijl dot nl
Summary: array_shift() fails with @ operator
Status: Verified
Type: Bug
Package: Scripting Engine problem
Operating System: *
PHP Version: 5.*, 6CVS (2009-04-30)
New Comment:
?php
$_SESSION['villas'] = array
(
1 = array(1,2,3),
2 = array(2,3,4),
3 = array(3,4,5),
4 = array(4,5,6),
);
/*
* ONE:
*/
/*
While(@$_SESSION['villas'] != array())
{
$row = array_shift(@$_SESSION['villas']);
print_r($row);
}// einde while
*/
/*
* TWO:
*/
/*
while($foo['villas'] != array())
{
$row = array_shift(@$foo['villas']); // Removing @ makes it work..
var_dump($foo);
}
*/
/*
* THREE:
*/
//I cann bypass this failure by using:
$arr_temp = @$_SESSION['villas'];
$row = array_shift($arr_temp);
$_SESSION['villas'] = $arr_temp;
unset($arr_temp);
var_dump($_SESSION['villas']);
?
Result:
One and Two, same as described before.
Three:
array
0 =
array
0 = int 2
1 = int 3
2 = int 4
1 =
array
0 = int 3
1 = int 4
2 = int 5
2 =
array
0 = int 4
1 = int 5
2 = int 6
PHP Version 5.2.10-2ubuntu6.4
System Linux 2.6.31-20-generic x86_64
Build Date Jan 6 2010 22:36:47
Server API Apache 2.0 Handler
PHP API 20041225
PHP Extension 20060613
Zend Extension 220060519
Debug Build no
Thread Safety disabled
Zend Memory Manager enabled
Apache/2.2.12 (Ubuntu)
Previous Comments:
[2009-04-13 18:23:01] j...@php.net
This has nothing to do with sessions. Simplified script:
?php
$foo['villas'] = array('a','b','c');
while($foo['villas'] != array())
{
$row = array_shift(@$foo['villas']); // Removing @ makes it work..
var_dump($foo);
}
?
[2009-03-16 22:11:28] Henry at huis-stijl dot nl
Tried with and without the @ same output.
[2009-03-16 16:26:07] j...@php.net
If you remove those @'s, what does it output..?
[2009-03-11 14:07:22] Henry at huis-stijl dot nl
?php
session_start();
ini_set('session.cache_limiter', 'private');
// © 2009 Huis-stijl, Henry Hekman
$_SESSION['villas'] = array
(
1 = array(1,2,3),
2 = array(2,3,4),
3 = array(3,4,5),
4 = array(4,5,6),
);
While(@$_SESSION['villas'] != array())
{
$row = array_shift(@$_SESSION['villas']);
print_r($row);
}// einde while
?
on php 4 i get
Array ( [0] = 1 [1] = 2 [2] = 3 ) Array ( [0] = 2 [1] = 3 [2] = 4
) Array ( [0] = 3 [1] = 4 [2] = 5 ) Array ( [0] = 4 [1] = 5 [2] =
6 )
on phph 5.2.9 i get a loop that doesnt end
Array ( [0] = 1 [1] = 2 [2] = 3 ) Array ( [0] = 1 [1] = 2 [2] = 3
) Array ( [0] = 1 [1] = 2 [2] = 3 ) Array ( [0] = 1 [1] = 2 [2] =
3 ) Array ( [0] = 1 [1] = 2 [2] = 3 ) Array ( [0] = 1 [1] = 2 [2]
= 3 ) Array ( [0] = 1 [1] = 2 [2] = 3 ) Array ( [0] = 1 [1] = 2
[2] = 3 ) Array ( [0] = 1 [1] = 2 [2] = 3 ) Array ( [0] = 1 [1] =
2 [2] = 3 ) Array ( [0] = 1 [1] = 2 [2] = 3 ) Array ( [0] = 1 [1]
= 2 [2] = 3 ) Array ( [0] = 1 [1] = 2 [2] = 3 )
[2009-03-11 12:56:34] Henry at huis-stijl dot nl
Description:
Script was working perfectly on PHP 4 when updated to PHP5.2.9 I found
an error. I was filling a array in the session and looped it with
array_shift until the arry was empty.
This loop kept giving me the first value but did not erased it from te
original arry.
Reproduce code:
---
$row = array_shift(@$_SESSION['villas']);
Expected result:
1. $row getting the first element from $_SESSION['villas']
2. $_SESSION['villas'] to get lost the first element.
Actual result:
--
1. $row getting the first element from $_SESSION['villas']
2. $_SESSION['villas'] did not lost the first element and was unchanged
I cann bypass this failure by using:
$arr_temp = @$_SESSION['villas'];
$row = array_shift($arr_temp);
$_SESSION['villas'] = $arr_temp;
unset($arr_temp);
--
Edit this bug report at http://bugs.php.net/bug.php?id=47623edit=1
