Description:
------------
smiley not converted

Reproduce code:
---------------
<?php
$arrayBBCode=array(
    ''=>        array('type'=>BBCODE_TYPE_ROOT,  'childs'=>'!i'),
    'b'=>        array('type'=>BBCODE_TYPE_NOARG, 'open_tag'=>'<b>', 'close_tag'=>'</b>'),
    'u'=>        array('type'=>BBCODE_TYPE_NOARG, 'open_tag'=>'<u>', 'close_tag'=>'</u>', 'flags'=>BBCODE_FLAGS_SMILEYS_OFF),
    'i'=>        array('type'=>BBCODE_TYPE_NOARG, 'open_tag'=>'<i>', 'close_tag'=>'</i>', 'childs'=>'b'),
);
$text=<<<EOF
[i] No parse Test [/i] :)
[b] Parsed, with smiley :( [/b]
[u] Parsed, with no smiley :D [/u]
EOF;
$BBHandler=bbcode_create($arrayBBCode);
bbcode_add_smiley($BBHandler, ":)", "<img src=\"smiley.gif\" alt=\":)\" />");
echo bbcode_parse($BBHandler,$text);
?>

Expected result:
----------------
smiley converted in tag html

Actual result:
--------------
smiley not converted in tag html