Edit report at https://bugs.php.net/bug.php?id=61963&edit=1
ID: 61963
User updated by: bsnxff at gmail dot com
Reported by: bsnxff at gmail dot com
Summary: array_rand seed use up
Status: Not a bug
Type: Bug
Package: Arrays related
Operating System: window xp sp3
PHP Version: 5.3.12
Block user comment: N
Private report: N
New Comment:
Have you tested this case?
rand() will return fixed values not random values.
but mt_rand() works
this is not what user expected.
<?php
$array = array_fill(0, 1000, 'a');
function ref(&$data = false)
{
global $array;
$data = &$array;
$a = randArray($data);
}
function randArray($data)
{
global $array;
//may be wrong here
$array[] = array_rand($array, 1);
return $data[rand(0, sizeof($data) - 1)];
}
$i = 1000;
while ($i--)
ref();
//echo mt_rand(0 , 10000);
//echo "\n";
echo $array[rand(0, sizeof($array) - 1)];
?>
Previous Comments:
------------------------------------------------------------------------
[2012-05-11 07:17:21] bsnxff at gmail dot com
Yes mt_rand works :S
Me bad luck.
------------------------------------------------------------------------
[2012-05-11 04:42:19] [email protected]
because it makes no sense and on operating systems with a decent random number
generator built in there is no bug. Windows XP is not such an operating system.
You can try mt_rand() and see if you have more luck with that. rand() gives you
the OS-native pseudo-random generator.
------------------------------------------------------------------------
[2012-05-11 04:04:42] bsnxff at gmail dot com
No one going to take this bug?
------------------------------------------------------------------------
[2012-05-06 11:42:59] bsnxff at gmail dot com
Description:
------------
run test_array_rand.php
Test script:
---------------
<?php
$array = array_fill(0, 1000, 'a');
echo rand(0 , 10000);
function ref(&$data = false)
{
global $array;
$data = &$array;
$a = randArray($data);
}
function randArray($data)
{
global $array;
//may be wrong here
$array[] = array_rand($array, 1);
return $data[rand(0, sizeof($data) - 1)];
}
$i = 1000;
while ($i--)
ref()
// Hi refresh it 3 - 10 times
// you will see
// random number no longer random
// 1 return 10
// 2 return 4453
// 3 return 1251
// 4 return 10
// 5 return 4453
// 6 return 1251
// ...
?>
Expected result:
----------------
make rand(0, 10000) random
Actual result:
--------------
rand(0, 10000) no longer random
------------------------------------------------------------------------
--
Edit this bug report at https://bugs.php.net/bug.php?id=61963&edit=1
