<?php
function strip_tags_attributes($string, $allowtags = NULL, $allowattributes = NULL)
{
    /* Credits to [email protected] (http://www.php.net/manual/en/function.strip-tags.php#91498) */
    $string = strip_tags($string,$allowtags);
    if (!is_null($allowattributes))
    {
        if(!is_array($allowattributes))
        {
            $allowattributes = explode(",",$allowattributes);
        }

        if(is_array($allowattributes))
        {
            $allowattributes = implode(")(?<!",$allowattributes);
        }

        if (strlen($allowattributes) > 0)
        {
            $allowattributes = "(?<!".$allowattributes.")";
        }

        $string = preg_replace_callback("/<[^>]*>/i",create_function('$matches', 'return preg_replace("/ [^ =]*'.$allowattributes.'=(\"[^\"]*\"|\'[^\']*\')/i", "", $matches[0]);'),$string);
    }

    return $string;
}
?>