Renaming multiple files when uploaded - php

Question

I have a form that uploads multiple file. The php code that I am using works fine but I would like to rename the files also and don't know how to go about this. I think adding a time stamp to the name would be the best answer. Here is the working code so far:
/* FILE UPLOAD CODE */
{
$number_of_file_fields = 0;
$number_of_uploaded_files = 0;
$number_of_moved_files = 0;
$uploaded_files = array();
$upload_directory = dirname(__file__) . '/uploads/'; //set upload directory
/**
* we get a $_FILES['file'] array ,
* we procee this array while iterating with simple for loop
* you can check this array by print_r($_FILES['file']);
*/
for ($i = 0; $i < count($_FILES['file']['name']); $i++) {
$number_of_file_fields++;
if ($_FILES['file']['name'][$i] != '') { //check if file field empty or not
$number_of_uploaded_files++;
$uploaded_files[] = $_FILES['file']['name'][$i];
if (move_uploaded_file($_FILES['file']['tmp_name'][$i], $upload_directory . $_FILES['file']['name'][$i])) {
$number_of_moved_files++;
}
}
}
}
/* END FILE UPLOAD CODE */
Any help on what to add and where to accomplish this would be greatly appreciated.

Answer 1

If you want to give the same name to all the uploaded files, then you can get the name by using $_GET.
For example:
<form action="upload.php" method="post"> \\ this would send it to your page
<input type='text' size='30' name='filename'/>
<input type='submit' />
</form>
simply get the name using $_GET like this
$name = $_GET['filename'];
and now run your code but move the file with this name like this
move_uploaded_file($_FILES['file']['tmp_name'][$i], $upload_directory . $name[$i])

Answer 2

You can specify the new file name as the second parameter in move_uploaded_file()
For example:
move_uploaded_file($_FILES['file']['tmp_name'][$i], $upload_directory . "new_file_name");