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Bug #17138 array_rand() is not random
Submitted: 2002-05-10 07:29 UTC Modified: 2002-06-03 14:00 UTC
Votes:8
Avg. Score:4.9 ± 0.3
Reproduced:8 of 8 (100.0%)
Same Version:5 (62.5%)
Same OS:2 (25.0%)
From: d dot crawford at blueyonder dot co dot uk Assigned:
Status: Closed Package: Arrays related
PHP Version: 4.2.0 OS: Windows 98
Private report: No CVE-ID: None
View Developer Edit
 [2002-05-10 07:29 UTC] d dot crawford at blueyonder dot co dot uk 
The code from the manual:

srand ((float) microtime() * 10000000);
$input = array ("Neo", "Morpheus", "Trinity", "Cypher", "Tank");
$rand_keys = array_rand ($input, 2);
print $input[$rand_keys[0]]."\n";
print $input[$rand_keys[1]]."\n";

always returns the same array elements.

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 [2002-05-21 17:56 UTC] matthias dot thalmann at sciontec dot com 
I've experienced the same problem on Win2K and WinNT4, regardless what your seed for srand() is. In PHP 4.1.2 everything's fine.
 [2002-06-03 14:00 UTC] edink@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.

The fix will be included in the next release of PHP.
 
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