Renaming a file upon upload

Hi

I have the following code

$uploaddir = ‘../images/deletables/’; // Relative path under webroot
$uploaddir2 = ‘/images/deletables/’; // Relative path under webroot

if(!empty($_FILES[‘userfile’][‘name’])){

$uploadfile = $uploaddir.basename.($_FILES[‘userfile’][‘name’]);
$loc = $uploaddir2.basename.($_FILES[‘userfile’][‘name’]);

if (move_uploaded_file($_FILES[‘userfile’][‘tmp_name’], $uploadfile)) {

$sql = mysql_query(“INSERT INTO hb_photo(photo_location) VALUES (‘”.my_safe($loc).”‘)”);

$id = mysql_insert_id();

$sql = mysql_query(“INSERT INTO hb_album_photo(album_id, photo_id) VALUES (‘”.my_safe($album).”‘, ‘”.my_safe($id).”‘)”);
}

}

How would i give the file name a number. For example 21.jpg, as opposed to the actual filename when uploaded.

Thanks

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