PHP Ajax Upload Progress Bar

<form enctype="multipart/form-data" action="upload.php" method="POST">
<input name="uploaded" type="file" />
<input type="submit" value="Upload" />
</form>

<?php
if(isset($_REQUEST['submit'])){
   $target = "data/".basename( $_FILES['uploaded']['name']) ;
   move_uploaded_file($_FILES['uploaded']['tmp_name'], $target);
}
?>

I know Javascript, AJAX and JQuery etc very well and I believe an upload progress bar can be created using PHP, AJAX and Javascript etc.

I am surprised how to get the size of upload (meaning each second I want to know, how much of the file is uploaded and how much is remaining, I think it should be possible using AJAX etc) file during upload is in process.

Here is link to the PHP manual but I didn't understand that: http://php.net/manual/en/session.upload-progress.php

Is there any other method to show the upload progress bar using PHP and AJAX but without use of any external extension of PHP? I don't have access to php.ini

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