PhP Upload progress in PhP 5.4 is not working. Session variables not set

I have a problem with PhP File Upload progress monitor at the very start.

First, here are the relevant PhP.ini settings (Directive, Local Value and Master Value):

     session.upload_progress.cleanup    On  On
     session.upload_progress.enabled    On  On
     session.upload_progress.freq   1%  1%
     session.upload_progress.min_freq   1   1
     session.upload_progress.name   PHP_SESSION_UPLOAD_PROGRESS  PHP_SESSION_UPLOAD_PROGRESS
     session.upload_progress.prefix upload_progress_    upload_progress_

Here is the form (simplified):

     <form id="fileupload" style="position:relative;" target="iframe_fileupload" action="http://www.athiyoga.org/testupload.php" method="POST" enctype="multipart/form-data">
            <input type="hidden" name="<?echo ini_get("session.upload_progress.name");?>" value="first"/>
             <input type="file" name="file_1">
            <button type="submit" >Start Submit</button>
      </form>

I have JQUERY Ajax code, in the same PhP file (of course, as a JS script), as in:

    $('#fileupload').submit(function(event){

    //UPDATED THIS PART after reading: https://mcmap.net/q/752077/-delay-in-populating-session-upload_progress-data
    //POSTING the magic variable PHP_SESSION_UPLOAD_PROGRESS during status inquiry too

       var params = {PHP_SESSION_UPLOAD_PROGRESS:"first", some_var:20 };
       var data_params = jQuery.param( params );
       setTimeout(function(){
              upload_promise = $.ajax({
                url: 'upload_status.php', 
                data: data_params,
                dataType: 'html',
                type    : 'POST',
                cache   : false 
             });
             $.when(upload_promise).done(function(status_response){
                   $('#response_status').html(status_response);
             });
        },5000);
      ...
      ...

The upload_status.php simply echoes the $_SESSION array. I also set a test session variable in the form-php to make sure that the AJAX (thru upload_status.php) picks that session variable. It does. But not a sign (no variable/index) of the upload status in the $_SESSION array! The files get uploaded. I made sure that the files are big enough so that the 5000ms is sufficient to report some intermediate status.

I have never implemented PhP file upload progress bar before so I wonder if I am missing something. Once I get one status-point in the upload, I will be able to do the rest.

Thanks

There could be some issues, I have listed down few of them.

The web server's request buffering has to be disabled for this to work properly, else PHP may see the file upload only once fully uploaded.
This feature doesn't work, when your webserver is running PHP via FastCGI.
Don't forget, that the session has to be initialized before the form is generated, otherwise you will get no information in the session.
It won't work in PHP 5.3 or earlier.
Note that if you run that code and you print out the content of $_SESSSION[$key] you get an empty array due that session.upload_progress.cleanup is on by default and it cleans the progress information as soon as all POST data has been read. Set it to Off or 0 to see the content of $_SESSION[$key].

This can help you to track your progress bar http://pecl.php.net/package/uploadprogress

I hope this will help you to dig out the problem.

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