#33556 [Opn->Bgs]: rand is not random !!!. Random number repeat every 32768 time .
| From: | helly@php.net | Date: | Sun, 03 Jul 2005 18:46:20 +0000 |
| Subject: | #33556 [Opn->Bgs]: rand is not random !!!. Random number repeat every 32768 time . | ||
| References: | 1 | Groups: | php.bugs |
| Request: | Send a blank email to php-bugs+get-81319@lists.php.net to get a copy of this message | ||
ID: 33556
Updated by: helly@php.net
Reported By: toslava at gmail dot com
-Status: Open
+Status: Bogus
Bug Type: *Math Functions
Operating System: windows 2003
PHP Version: 5.0.4
New Comment:
Sorry, but your problem does not imply a bug in PHP itself. For a
list of more appropriate places to ask for help using PHP, please
visit http://www.php.net/support.php as this bug system
is not the
appropriate forum for asking support questions. Due to the volume
of reports we can not explain in detail here why your report is not
a bug. The support channels will be able to provide an explanation
for you.
Thank you for your interest in PHP.
Ask Microsoft, php just wraps a windows api function.
Previous Comments:
------------------------------------------------------------------------
[2005-07-03 20:31:59] toslava at gmail dot com
Description:
------------
rand is not random !!!. Random number repeat every 32768 time
:-(((
_ 0 _ _ 8512030 _
_ 1 _ _ 5655227 _
_ 2 _ _ 6934082 _
_ 3 _ _ 2293270 _
.......
_ 32768 _ _ 8512030 _
_ 32769 _ _ 5655227 _
_ 32770 _ _ 6934082 _
_ 32771 _ _ 2293270 _
......
Reproduce code:
---------------
echo '<pre>';
for ($i=0; $i<160000; $i++) {
$ch01=rand(900000, 9999999);
echo " _ $i _ \t _ $ch01 _ \n"; }
Expected result:
----------------
.....
realy random number !
Actual result:
--------------
_ 0 _ _ 8512030 _
_ 1 _ _ 5655227 _
_ 2 _ _ 6934082 _
_ 3 _ _ 2293270 _
.......
_ 32768 _ _ 8512030 _
_ 32769 _ _ 5655227 _
_ 32770 _ _ 6934082 _
_ 32771 _ _ 2293270 _
......
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=33556&edit=1