Last modified: 2006-12-11 21:09:59 UTC

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Bug 8121 - wfRandom() is not between 0 and 1
wfRandom() is not between 0 and 1
Product: MediaWiki
Classification: Unclassified
General/Unknown (Other open bugs)
All All
: Normal trivial (vote)
: ---
Assigned To: Nobody - You can work on this!
Depends on:
  Show dependency treegraph
Reported: 2006-12-02 16:02 UTC by Lejonel
Modified: 2006-12-11 21:09 UTC (History)
0 users

See Also:
Web browser: ---
Mobile Platform: ---
Assignee Huggle Beta Tester: ---


Description Lejonel 2006-12-02 16:02:13 UTC
wfRandom returns a value greater than 1 with a probability of ~2^-31 (if
mt_getrandmax == 2^31-1). I don't think that will cause any problems, but a
comment in the code says the value should be between 0 and 1.

Here is a "correct" version of the function:

function wfRandom() {
    # The maximum random value is "only" 2^31-1, so get two random
    # values to reduce the chance of dupes
    $max = mt_getrandmax() + 1;
    $rand = number_format( (mt_rand() * $max + mt_rand())
        / $max / $max, 12, '.', '' );
    return $rand;
Comment 1 Antoine "hashar" Musso (WMF) 2006-12-11 21:09:59 UTC
Fixed in r18271

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