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Bug #33556 rand is not random !!!. Random number repeat every 32768 time .
Submitted: 2005-07-03 20:31 UTC Modified: 2005-07-03 20:46 UTC
From: toslava at gmail dot com Assigned:
Status: Not a bug Package: *Math Functions
PHP Version: 5.0.4 OS: windows 2003
Private report: No CVE-ID: None
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From: toslava at gmail dot com
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 [2005-07-03 20:31 UTC] 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 _ 
......

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 [2005-07-03 20:46 UTC] helly@php.net 
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.
 
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