How to check if a folder exists using PHP

edsonlp1

I have this code to check if a folder exists using PHP and it works correctly with xampp in windows, but when I try to move that page to a server, it doesn’t work.

Here is my code:

  function validate (&$valores, &$errores, $campo, $carpeta)
    {
    $valores [$campo] = $carpeta;
            if ((file_exists($carpeta) && is_dir($carpeta))==false)
            {
                    $errores[$campo] = true;                   
            }
            else
            {
                    $errores[$campo] = false;
            }
    }

There is an alternative to the code that I’m doing?

Thanks in advance