From: sv4php at fmethod dot com
Operating system: Windows XP
PHP version: 5.2.6
PHP Bug Type: *Math Functions
Bug description: rand() after array_rand() produces the same numbers
Description:
------------
This was discovered by another guy who asked me to verify it on my
configuration (and I confirmed it). I'm not sure he reported it, so just in
case I do as well.
The example source code produced 989, 377, 989, 377 from rand() ad
infinitum under Windows XP, Apache 2.2, PHP 5.2.6.
Important:
- Linux apparently not affected.
- mt_rand() apparently not affected.
Reproduce code:
---------------
function RandomNumber() {
$f1 = array();
for ($i = 0; $i < 50000; $i++) {
$f1[] = true;
}
$k = array_rand($f1);
$rnum = rand(1,999);
return $rnum;
}
for ($i = 0; $i < 20; $i++) {
echo RandomNumber()."\n"; // produces a sequence of 377, 989, 377, 989,
377, 989, 377... here
}
Expected result:
----------------
Random numbers.
Actual result:
--------------
Same number or narrow repeated sequence.
--
Edit bug report at http://bugs.php.net/?id=45302&edit=1
--
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=45302&r=trysnapshot52
Try a CVS snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=45302&r=trysnapshot53
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=45302&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=45302&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=45302&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=45302&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=45302&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=45302&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=45302&r=support
Expected behavior: http://bugs.php.net/fix.php?id=45302&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=45302&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=45302&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=45302&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=45302&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=45302&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=45302&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=45302&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=45302&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=45302&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=45302&r=mysqlcfg
