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Bug #16926 Shuffle doesn't work
Submitted: 2002-04-30 08:14 UTC Modified: 2002-06-18 19:55 UTC
From: joseppo at hotmail dot com Assigned:
Status: Closed Package: Arrays related
PHP Version: 4.2.0 OS: WinXP
Private report: No CVE-ID: None
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 [2002-04-30 08:14 UTC] joseppo at hotmail dot com 
As of PHP 4.2.0, shuffle() doesn't seem to work for me.
The following code always produce the same output:
function make_seed() { // Taken directly from the manual
    list($usec, $sec) = explode(' ', microtime());
    return (float) $sec + ((float) $usec * 100000);
}

srand(make_seed());
$arr = range(1, 10);
shuffle($arr);
print_r($arr);


Further testing shows that I get the same output if I uncomment the srand(), if that's any help.

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 [2002-05-01 03:08 UTC] derick@php.net 
I could not reproduce this, are you sure the browser is not caching your page?

Derick
 [2002-05-01 05:06 UTC] joseppo at hotmail dot com 
Yes, I'm sure. I've tried running it from the command line with the same result.
I've done a little more testing, and it seems that rand() seems to work just fine, so that should more or less exclude the possibility of a bug in srand().

I've also done a full reinstall (just to make sure) without any luck.
 [2002-05-01 12:39 UTC] rodif_bl@php.net 
I made patch for this awhile ago. It never was commited.

http://bugs.php.net/bug.php?id=7045
 [2002-06-18 19:55 UTC] sniper@php.net 
This bug has been fixed in CVS. You can grab a snapshot of the
CVS version at http://snaps.php.net/. In case this was a documentation 
problem, the fix will show up soon at http://www.php.net/manual/.
In case this was a PHP.net website problem, the change will show
up on the PHP.net site and on the mirror sites.
Thank you for the report, and for helping us make PHP better.
 
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