How do I set any data while script still executing? - php

Question

Right now I'm using an event-stream to echo the upload progress from another script to the user, but no matter how I try to pass the variable from the form-data progressing php file to my event-stream file, it doesn't work.
The problem is, that all changes I make in my running php script for the file upload only become visible after full script execution on my server, while it's working fine on my local machine.
I've tried writing to files in my web directory, in the tmp directory and using a mysql database, but none of them worked.
Here's what my upload progressing php script roughly looks like with the sql solution:
$progress = 0;
foreach ($files as $file) {
sql("UPDATE `tmp` SET `progress`=? WHERE `ID`=?", $progress, $id);
imagejpeg($image, "images/gallery/$filename.jpg", 100);
$progress++;
}
And my event-stream php script:
echo "data: ".sql("SELECT `progress` FROM `tmp` WHERE `ID`=?", $id)."\n\n";
I would appreciate any solution how to solve this problem, best without installing any php libraries.
Thanks

Answer 1

I've solved my problem by flushing the progress to the user over the upload script and handling the output by checking the xhr.responseText periodically.
PHP (flushes line break + progress)
foreach ($files as $drop => $file) {
echo "\n$progress";
flush();
// file progressing
}
JavaScript (gets progress after last line break)
setInterval(function() {
if (page.xhr.readyState == 3 && page.xhr.status == 200) {
var response = page.xhr.responseText;
$('#progress').stop().animate({width: parseFloat(response.substr(response.lastIndexOf("\n")+1))+'%'}, 480);
}
}, 1000);