Problema inserimento controllo su script multiupload...

[pollat]

Ciao a tutti,
ho un problema con uno script multiupload, in pratica devo inserire il controllo di @file gi' esistente (per evitare sovrascrizioni di file)...

il form per l-upload è questo:

<form action="" method="post" enctype="multipart/form-data" onSubmit="showSpindle()" method="POST">
            <input type="file" name="files[]" multiple="multiple">
            <input type="submit" value="Upload">
        </form>

mentre lo script per l-upload è:

<?php


$valid_formats = array("jpg", "png", "gif", "zip", "bmp", "mp3" );
$max_file_size = 1024*10000; //10000 kb
$path = "nomecartella/"; // Upload directory
$count = 0;

if(isset($_POST) and $_SERVER['REQUEST_METHOD'] == "POST"){
    // Loop $_FILES to execute all files
    foreach ($_FILES['files']['name'] as $f => $name) {     
        if ($_FILES['files']['error'][$f] == 4) {
            continue; // Skip file if any error found
        }           
        if ($_FILES['files']['error'][$f] == 0) {               
            if ($_FILES['files']['size'][$f] > $max_file_size) {
                $message[] = "$name is too large!.";
                continue; // Skip large files
            }
elseif( ! in_array(pathinfo($name, PATHINFO_EXTENSION), $valid_formats) ){
                $message[] = "$name is not a valid format";
                continue; // Skip invalid file formats
 }
            else{ // No error found! Move uploaded files 
                if(move_uploaded_file($_FILES["files"]["tmp_name"][$f], $path.$name)) {
                    $count++; // Number of successfully uploaded files
                }
            }
        }
    }
}
?>

ho provato ad inserire:

if (file_exists("nomecartella/" . $_FILES["files"]["name"])){
                $message[] = "$name è già esistente, cambiare nome al file";
                continue; // Skip invalid file formats 

ma qualsiasi file tenti di caricare mi sovrascrive il file e quindi non va.... perchèèèèèèè?

[pollat]

soluzione...

al posto dell-ultimo else mettere

else{ 

                if(!file_exists($path.$name))
                {
                  move_uploaded_file($_FILES["files"]["tmp_name"][$f], $path.$name);
                  $count++; // Number of successfully uploaded file
                } 
                else{
                    echo "File exists";
                                }


  }