From: Kazeuri at Gmail dot com
Operating system: SUSE 10
PHP version: 4.4.2
PHP Bug Type: Unknown/Other Function
Bug description: rand and mt_rand BUG
Description:
------------
rand and mt_rand (which, no longer need to be seeded...) get stuck on the
same "result" after a certain number of generations. I am unsure exactly
why this is, and PLEASE, read in to this, its very easy at first to view
this as a mistake, but according to all the documentation I have read,
this should NOT occur.
Reproduce code:
---------------
header("Content-type: image/png");
$stext = "some text";
$x = 800;
$y = 600;
$im = @imagecreate($x, $y) or die("Cannot Initialize new GD image
stream");
$background_color = imagecolorallocate($im, 0, 0, 0);
$stnum = 0;
while ($stnum <= 125){
$stize = rand(0,5);
$xl = rand(0,800);
$yl = rand(0,600);
$text_color = imagecolorallocate($im, mt_rand(0,255), mt_rand(0,255),
mt_rand(0,255));
imagestring($im, $stize, $xl, $yl, $stext, $text_color);
$stnum += 1;
}
imagepng($im);
imagedestroy($im);
Expected result:
----------------
An image with randomly generated text all over it in various places
(random).
Actual result:
--------------
This works fine, for about 50 results or so, and then somehow, ALL THREE
rand functions that contribute to the text color get "stuck" and one
particular color begins to dominate (which changes randomly each time it
is generated).
--
Edit bug report at http://bugs.php.net/?id=37409&edit=1
--
Try a CVS snapshot (PHP 4.4):
http://bugs.php.net/fix.php?id=37409&r=trysnapshot44
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=37409&r=trysnapshot52
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=37409&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=37409&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=37409&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=37409&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=37409&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=37409&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=37409&r=support
Expected behavior: http://bugs.php.net/fix.php?id=37409&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=37409&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=37409&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=37409&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=37409&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=37409&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=37409&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=37409&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=37409&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=37409&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=37409&r=mysqlcfg
