Description:
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The rand() function under Windows XP Pro and possibly other Windows OSs generates numbers in a strict even-odd-even-odd pattern.  The pattern doesn't occur on *nix OSs

Reproduce code:
---------------
<?php
for (i = 0; i < 100; i++)
    echo rand()."<br />\n";
?>

Expected result:
----------------
expected numbers with no noticable pattern

Actual result:
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numbers were in an even-odd-even-odd pattern