Description:
------------
I notices that something in my code not giving expected result and when digging 
some more I notices that rand(0,limit) don't give the same "opportunity" to that 
'0'. in other words, the random distribution is very bad.
in a 10,000 calls to random like this: rand(0,7), I noticed that the 0 hit only 
2000 while 1,2,3,4,5,6,7 all hit about 16300 times. this is a ratio of 770%

If the range start with number bigger than 0, it works well. ex. rand(1,8)-1 work 
correctly but rand(0,7) doesn't

---
From manual page: http://www.php.net/function.rand#refsect1-function.rand-
description
---


Test script:
---------------
$ar =array('AA','BB','CC','DD','EE','FF','GG');
$cnt=array();
$len=count($ar)-1;
for($i=0;$i<100000;$i++){ $c = $ar[rand(0,$len)]; @$cnt[$c]++; }
print_r($cnt);

---- result:
    [BB] => 16245
    [AA] => 2003
    [FF] => 16260
    [EE] => 16281
    [DD] => 16369
    [GG] => 16508
    [CC] => 16334


Expected result:
----------------
the expected result of course should be that rand(0,limit) over many calls will 
distribute the hits evenly between all the range