Description:
------------
When I run the following script I get strange results that are difficult to test against, and when converted to json, a real pain to use on the client-side.

<?php
    $xml = new SimpleXMLElement('<foo><bar><![CDATA[]]></bar><baz/></foo>', LIBXML_NOCDATA);
    print_r($xml);
    $json = json_encode($xml);
    echo "{$json}\n";
?>

Since bar is empty (Even though it has a CDATA tag that is removed) before it gets to me ... I should get something like this
bar => ""
OR
at most ...
bar => SimpleXMLElemebt object ()

but ... what I don't expect is this:

SimpleXMLElement Object
(
    [bar] => SimpleXMLElement Object
        (
            [0] => 
        )
...

When this data is converted to json ... I get bar:{"0":""} which requires me to do typeof and other types of tests on the client-side.

I mentioned this issue to our resident FE PHP expert here at Y! and they said to file a bug.



Reproduce code:
---------------
Run this script on the command line:

<?php
    $xml = new SimpleXMLElement('<foo><bar><![CDATA[]]></bar><baz/></foo>', LIBXML_NOCDATA);
    print_r($xml);
    $json = json_encode($xml);
    echo "{$json}\n";
?>

Expected result:
----------------
SimpleXMLElement Object
(
    [bar] => ""
)

OR 

SimpleXMLElement Object
(
    [bar] => SimpleXMLElement Object
    (
    )
)

Actual result:
--------------
SimpleXMLElement Object
(
    [bar] => SimpleXMLElement Object
    (
        [0] => ""
    )
)