Description:
------------
Whenever rand () or mt_rand () are passed with a min=0, 0 gets reported less often than it should be. mt_rand (0,1) returns 1 75% of the time, for example, while mt_rand (1,2) works as expected.

Reproduce code:
---------------
<?php
  $arr = array ();
  for ($i = 0; $i < 100000; $i++)
    {
      $c = mt_rand (0,1);
      if (!isset ($arr[$c])) $arr[$c] = 1;
      else $arr[$c]++;
    }
  ksort ($arr);
  foreach ($arr as $key => $value)
      echo '<b>'.$key.':</b> '.$value.'<br />';

Expected result:
----------------
0 and 1 should each get ~50,000 results

Actual result:
--------------
0 gets ~25k results and 1 gets ~75k