Description:
------------
Fetching rows using different fetch styles works for single PDO::fetch() method, as shown here - http://www.php.net/manual/ru/function.PDOStatement-fetch.php

Hovewer it doesn't work for PDO::fetchAll() method

Reproduce code:
---------------
<?php
$sth = $dbh->prepare("SELECT domain_name, domain_id FROM pub_domains");
$sth->execute();

print_r($sth->fetchAll(PDO::FETCH_ASSOC));
print_r($sth->fetchAll(PDO::FETCH_BOTH));
?>

Expected result:
----------------
<?php
Array
(
    [0] => Array
        (
            [DOMAIN_NAME] => apple.com
            [DOMAIN_ID] => 3
        )

)

Array
(
    [0] => Array
        (
            [DOMAIN_NAME] => apple.com
            [0] => apple.com
            [DOMAIN_ID] => 3
            [1] => 3
        )

)
?>

Actual result:
--------------
<?php
Array
(
    [0] => Array
        (
            [DOMAIN_NAME] => apple.com
            [DOMAIN_ID] => 3
        )

)

Array
(
)
?>