From: RQuadling at GMail dot com
Operating system: Windows XP SP3
PHP version: 5.3.0alpha2
PHP Bug Type: Math related
Bug description: rand maxes out after a few calls.
Description:
------------
Hi.
I was testing an encryption/decryption routine by passing it random
lengths of random data.
I realized that in a very short amount of time, all the strings being
tested were the same length.
I've reduced the string building code to the bare minimum.
Reproduce code:
---------------
<?php
$i_Count = 0; // By the 6'th loop, we are stuck on 32767.
while(++$i_Count <= 20) {
$s_Data = '';
$j = rand();
for($i = 0 ; $i < $j ; ++$i) {
$s_Data .= chr(rand(0, 255));
}
echo $i_Count, ' ', $j, ' ', strlen($s_Data), "\n";
}
Expected result:
----------------
1 randomvalue1 randomvalue1
2 randomvalue2 randomvalue2
3 randomvalue3 randomvalue3
4 randomvalue4 randomvalue4
5 randomvalue5 randomvalue5
6 randomvalue6 randomvalue6
7 randomvalue7 randomvalue7
8 randomvalue8 randomvalue8
9 randomvalue9 randomvalue9
10 randomvalue10 randomvalue10
11 randomvalue11 randomvalue11
12 randomvalue12 randomvalue12
13 randomvalue13 randomvalue13
14 randomvalue14 randomvalue14
15 randomvalue15 randomvalue15
16 randomvalue16 randomvalue16
17 randomvalue17 randomvalue17
18 randomvalue18 randomvalue18
19 randomvalue19 randomvalue19
20 randomvalue20 randomvalue20
Actual result:
--------------
1 randomvalue1 randomvalue1
2 randomvalue2 randomvalue2
3 randomvalue3 randomvalue3
4 randomvalue4 randomvalue4
5 randomvalue5 randomvalue5
6 32767 32767
7 32767 32767
8 32767 32767
9 32767 32767
10 32767 32767
11 32767 32767
12 32767 32767
13 32767 32767
14 32767 32767
15 32767 32767
16 32767 32767
17 32767 32767
18 32767 32767
19 32767 32767
20 32767 32767
--
Edit bug report at http://bugs.php.net/?id=46097&edit=1
--
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=46097&r=trysnapshot52
Try a CVS snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=46097&r=trysnapshot53
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=46097&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=46097&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=46097&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=46097&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=46097&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=46097&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=46097&r=support
Expected behavior: http://bugs.php.net/fix.php?id=46097&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=46097&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=46097&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=46097&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=46097&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=46097&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=46097&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=46097&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=46097&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=46097&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=46097&r=mysqlcfg
