Rename uploaded image in numeric sequence (i + 1) - php

Question

I have a json post that uploads photos. It works just fine. I want to change the name of the uploaded file as it is uploaded. I know how to do that. I want to add a number to the end of the file name before the image type extension. I know how to do that. I want the number to increment by one for each new file when I upload multiple images at once. I cant do that :-( Here is what Im working with:
if (!file_exists($vendimagepath) ) {
mkdir($vendimagepath,0777,TRUE);
}
$valid_extensions = array('gif', 'png', 'jpeg', 'jpg');
$uploader = new FileUpload('uploadfile');
// Handle the upload
$result = $uploader->handleUpload($vendimagepath);
if (!$result) {
exit(json_encode(array('success' => false, 'msg' => $uploader->getErrorMsg())));
} else {
echo json_encode(array('success' => true));
$_SESSION['success']=true;
$path = $uploader->getFileName();
$vendimagepath= $vendimagepath.$path;
$result = $db -> query("INSERT into vendimages (vendregid, vendimagepath) VALUES ('$vendredig', '$path')");
$result = $db -> update("UPDATE registervendors SET images='1' WHERE regid = '$vendredig' AND username='$vendusername' ");
}
I inserted a variable under the if statement at the top $x=1; and then under the $uploader=new fileupload I added a while loop with $x++; and put that closing brace at the end of the script. It didnt work. It uploaded files but they all end up with the same number (1) . I know why. The script is called for each new file uploaded so $x=1 restarts each time and therefore $x++ is 1 each time.

Answer 1

Since you want to count across page loads, you should use your $_SESSION. Before the uploads start set:
$_SESSION['upload_index'] = 1;
Then do $_SESSION['upload_index']++ each time you get a new uploaded file.