move_uploaded_file() can't upload files in a Hosting Server - php

Question

In my localhost server, with apache installed, I can upload files fine. But when I move everything to a hosting server (like Altervista.org) files doesn't upload.
Here's the html code:
<form id="fileupload" action="" method="POST">
<input id="filesupload" type="file" multiple name="files" accept=".jpg" accessKey="PDF"/>
<button id="MegaUpload" type="button" class="btn btn-primary start" onclick="conversion()">
</form>
Assuming that HTML Works well, I transfer everything in an AJAX and I can connect fine to the server.
PHP code can receive the input file as well, but when I try to do the upload, it doesn't work.
Here's PHP code:
if (isset($_FILES['fileToUpload'])) {
if (!isset($_COOKIE['users'])) {
setcookie('users', md5(time()/1234), time() + (86400), "/");
}
if (!file_exists('files/uploads/' . $_COOKIE['users'] . '/')) {
mkdir("files/uploads/" . $_COOKIE['users'], 0755);
mkdir("files/uploads/" . $_COOKIE['users'] . "/tmp", 0755);
}
$target_dir = 'files/uploads/' . $_COOKIE['users'] . '\/tmp\/';
for ($s=0; $s <= 10; $s++) {
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"][$s]);
if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"][$s],
$target_file)) {
//ok
}
else{
//something wrong
}
}
}
Again: Assuming that AJAX works fine (because I tested, and server receives the files I input), why in the hosting server it doesn't work?
It creates directories perfectly fine, there are directory permissions too, as you can see, and I checked in FileZilla if every .php files is setted to '0755'.
If you can't understand what's going on, I can post the AJAX part if you wish.
Thank you.
EDIT:
I edited the PHP part, so you know is a loop.
I added the enctype='multipart/form-data' as you said but still no result.
I forgot to put the multiple part on the HTML too.
Here's the AJAX part as you asked:
$("#filesupload").change(function(evnt) {
var fd = new FormData();
for (var s = 0; s < ins; s++) {
fd.append("fileToUpload[]", document.getElementById('filesupload').files[s]);
}
$.ajax({
url: 'upload.php', // point to server-side PHP script
dataType: 'text', // what to expect back from the PHP script, if anything
cache: false,
contentType: false,
processData: false,
data: fd,
type: 'post',
async: false,
success: function(result){
alert(result);
},
error: function(result) {
alert(result);
}
});
}
I tested with alerts and echos, and I know the servers receives the file(s), but it doesn't upload.

Answer 1

Create a
<?php phpinfo(); ?>
file on the hosting server and check the section file_uploads. This should be on ON.
If it is OFF or FALSE you may have no rights for a file upload. For this you should contact the admin of the hosting server. If you are the root, you can set this status to ON using this link: here