Add ending slash

function add_ending_slash($path){

$slash_type = (strpos($path, '\\')===0) ? 'win' : 'unix';

$last_char = substr($path, strlen($path)-1, 1);

if ($last_char != '/' and $last_char != '\\') {
// no slash:
$path .= ($slash_type == 'win') ? '\\' : '/';
}

return $path;
}

$path = rtrim( $path, DIRECTORY_SEPARATOR ) . DIRECTORY_SEPARATOR;

$path = rtrim( $path, DIRECTORY_SEPARATOR ) . DIRECTORY_SEPARATOR;

simple and useful :thumbsup: