PHP: define name for file upload - php

Question

I have a peace of code that stores profile images in the map "images/profiles" and stores the URL in the database. I want to define the name of the uploaded profile picture to be the $ID of the user. How can I do this?
include("../../core/init.inc.php");
$target = "../images/profiles/";
$target = $target . basename($_FILES['photo']['name']);
$pic = $_FILES['photo']['name'];
if(move_uploaded_file($_FILES['photo']['tmp_name'], $target)) {
echo "The file ". basename($_FILES['photo']['name']). " has been uploaded";
} else {
echo "ERROR";
}
mysql_query("UPDATE users SET image_url='includes/images/profiles/$pic' WHERE username = '".mysql_real_escape_string($_SESSION['username'])."'");
Now when someone uploads his profile picture (lets call it pf1.png) it saves it as "pf1.png". I want it to be saved like "$ID.png" (.png being a random extension). I want to accomplish this both for the move_upload_file function and updating the 'image_url' database column correctly.

Answer 1

According to the example in the documentation you can provide the filename in the destination of move_uploaded_file(). If that fails you can simply rename() the file after saving it.

Answer 2

try changing
$target = $target . basename($_FILES['photo']['name']);
to:
$filename=$_FILES["file"]["tmp_name"];
$extension=end(explode(".", $filename));
$target = target . $_SESSION["ID"].".".$extension;
side note: You are not escaping $pic this makes your site vulnerable to sql-injection

Answer 3

I don't know how you saved the ID of the user, but to make it easy let's assume you stored the ID in a session.
Then simply change the $target.
$target = $target . $_SESSION['ID'];
Also change your query as follows:
$url = "includes/images/profiles/" . $_SESSION['ID'];
SET image_url="$url"
Note: I don't know why you got an image folder inside an includes folder, but I guess you made that choice for yourself.

Answer 4

you can get the last inserted id and make it as a name of your image/uploaded file
$qry = mysqli_query($dbconnection,"INSERT INTO statements here");
$last_id = mysqli_insert_id($dbconnection);
//$ext= you get the extension of the file uploaded
move_uploaded_file($tmpname,$target.$last_id.$ext);
now if you want it to be accomplished in updating also.
you can always get the ID of the data you want to fetch and make it as a basis in updating.
ex.
$id = $_GET['id'] || $id = $row['id']; //anything depends on how you want it to retrieve
then you can do the query and move_uploaded_file function
$qry = mysqli_query($dbconnection,"UPDATE tblname SET field='$anything' WHERE id = '$id'");
move_uploaded_file($tmpname,$target.$id.$ext);
of course $tmpname will be the basis on what file you have uploaded, $tmpname will be the file you want to move into your desired directory