Description:
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PHP 5.2.10 introduced a controversial BC break in array_rand() function that doesn't sort array values when the $num_req param is equal to array count.

This was the most incomprehensive change I've seen in the PHP development so far.

If I have a random $num_req between 1 and array count I'll need to check if I've to use array_rand() ou shuffle()? It seems so stupid...

On the other hand, if this change will remain it need to be fixed anyway: there's no sense in allow array count in $num_req - it returns the array unchanged with no warnings. In this case this parameter should receive a value less than the array count. And it should be nice to have shuffle() use recommendation in the warning if $num_req is equal to array count.

BTW, the manual notes about this array_rand() change is very very very incomprehensive.

Reproduce code:
---------------
<?php

$array = range('a', 'z');

foreach (array_rand($array, count($array)) as $key) {
    print $array[$key];
}

?>

Expected result:
----------------
MAYBE: frkzmnvuyiptdcsewbxgjqhloa

Actual result:
--------------
ALWAYS: abcdefghijklmnopqrstuvwxyz