digit_e2b revision 3

function digit_e2b($str)
{
    $html_entity_regx = '&(#|\w+)\d+;';
    $callback = create_function('$matches','
if(preg_match("%' . $html_entity_regx . '%",$matches[0])) {
        return $matches[0];
    }
    $en_digit = array(1,2,3,4,5,6,7,8,9,0);
    $bn_digit = array("১","২","৩","৪","৫","৬","৭","৮","৯","০");
    return str_replace($en_digit, $bn_digit, $matches[0]);
');

    $converted = preg_replace_callback('%' . $html_entity_regx . '|[,\d]+%',$callback,$str);

    return $converted;
}