Salve,io ho questo script php che fa l'upload,non so perchè ma quando lo testavo in locale mi faceva perfettamente l'upoad invece quando l'ho caricato sul serve di altervista non mi salva il file nella cartella da me specificata.Cosa c'è che non va?
ecco lo script...
function getExtension($str) {

$i = strrpos($str,".");
if (!$i) { return ""; }
$l = strlen($str) - $i;
$ext = substr($str,$i+1,$l);
return $ext;
}

define ("MAX_SIZE","400");

$errors=0;

if($_SERVER["REQUEST_METHOD"] == "POST")
{
$image =$_FILES["file"]["name"];
$uploadedfile = $_FILES['file']['tmp_name'];

if ($image)
{
$filename = stripslashes($_FILES['file']['name']);
$extension = getExtension($filename);
$extension = strtolower($extension);
if (($extension != "jpg") && ($extension != "jpeg")
&& ($extension != "png") && ($extension != "gif"))
{
echo ' Unknown Image extension ';
$errors=1;
}
else
{
$size=filesize($_FILES['file']['tmp_name']);

if ($size > MAX_SIZE*9000)
{
echo "You have exceeded the size limit";
$errors=1;
}

if($extension=="jpg" || $extension=="jpeg" )
{
$uploadedfile = $_FILES['file']['tmp_name'];
$src = imagecreatefromjpeg($uploadedfile);
}
else if($extension=="png")
{
$uploadedfile = $_FILES['file']['tmp_name'];
$src = imagecreatefrompng($uploadedfile);
}
else
{
$src = imagecreatefromgif($uploadedfile);
}

list($width,$height)=getimagesize($uploadedfile);

$newwidth=80;
$newheight=($height/$width)*$newwidth;
$tmp=imagecreatetruecolor($newwidth,$newheight);



imagecopyresampled($tmp,$src,0,0,0,0,$newwidth,$ne wheight,
$width,$height);



$filename = "image_files/". $_FILES['file']['name'];


imagejpeg($tmp,$filename,100);


imagedestroy($src);
imagedestroy($tmp);

}
}
}
//If no errors registred, print the success message

if(isset($_POST['Submit']) && !$errors)
{
// mysql_query("update SQL statement ");
echo "Image Uploaded Successfully!";

}