Description:
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I think PHP needs proper way to check if the FTP directory exists, right now there is no correct way to do it other then using ftp_chdir/is_dir and check the results which produce E_WARNING if the directory doesn't exists.

there is also is_dir() function which require that you re-authenticate just to check if the directory exists and if you have to check multiple directories you have to re-authenticate each time.

i hacked this function in "test script" just to bypass the E_WARNING 

Test script:
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function dir_exists2($conn, $dir) {
    $orginal = $dir;
    if ( !$conn )
        return false;

    if ( substr($dir, -1) === '/' )
        $dir = substr($dir, 0, strlen($dir)-1);

    $dir    = substr($dir, 0, strlen($dir)-strlen(strrchr($dir,'/')));

    $res  = ftp_nlist($conn, '-dF '. $dir);
    if ( isset($res) AND is_array($res) ) {
            foreach ($res as $key => $value) {
                if ($value === $orginal)
                    return true;
            }
        }
        return false;
    }

Expected result:
----------------
true if directory exists and false if it does not exists.