Upload s auto-increment...

$_dir['uploaded'] = "adresar/";

$file = $_FILES['subor']['name'];
$file_postfix = strrchr($file,'.');
$file_name = substr($file,0,strlen($file)-strlen($file_postfix));
$subor = $file_name.$file_postfix;

if(file_exists($_dir['uploaded'].$subor)) {
   $i=1;   
   while(file_exists($_dir['uploaded'].$file_name.$i.$file_postfix)) {
      $i++;
   }       
   
   $subor = $file_name.$i.$file_postfix;
}

move_uploaded_file($_FILES['subor']['tmp_name'],$_dir['uploaded'].$subor);