#StackBounty: #javascript #php #post #http-post Get bytes transferred using PHP5 for POST request

Bounty: 50

Note I am new to PHP, Apache and programming for servers so more thorough explanations will be appreciated.


I created – in javascript – a progress bar to display when a file is uploaded. Current I have the progress bar update at a set frame-rate (to see if it works).

Clearly to make this an accurate progress bar, everything should in relation to the number of bytes transferred in comparison to the total number of bytes.


using PHP5 how can I get information regarding the number of bytes transferred in relation to the total number of bytes of the file, such that I can pass that to a JS function updateProgress(bytesSoFar, totalBytes) to update my progress bar? Please verbosely walk me through the modifications needed to the code below to get this to work. I have seen xhr examples, but they are not thoroughly accessible.

I have just set up LocalHost and am using W3Schools’ PHP File Upload tutorial. To get the simulated ”upload” to work, I changed the local permissions as suggested in this S.O. post. I don’t necessarily need to read the file, I just want to know many bytes have been transferred.


Currently I have two files:

  • index.php

  • upload.php


<!DOCTYPE html>

<form action="upload.php" method="post" enctype="multipart/form-data">
    Select image to upload:
    <input type="file" name="fileToUpload" id="fileToUpload">
    <input type="submit" value="Upload Image" name="submit">



$target_dir = "uploads/";
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
$uploadOk = 1;
$imageFileType = pathinfo($target_file,PATHINFO_EXTENSION);
// Check if image file is a actual image or fake image
if(isset($_POST["submit"])) {
    $check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);
    if($check !== false) {
        echo "File is an image - " . $check["mime"] . ".";
        $uploadOk = 1;
    } else {
        echo "File is not an image.";
        $uploadOk = 0;
// Check if file already exists
if (file_exists($target_file)) {
    echo "Sorry, file already exists.";
    $uploadOk = 0;
// Check file size
if ($_FILES["fileToUpload"]["size"] > 500000) {
    echo "Sorry, your file is too large.";
    $uploadOk = 0;
// Allow certain file formats
if($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg"
&& $imageFileType != "gif" ) {
    echo "Sorry, only JPG, JPEG, PNG & GIF files are allowed.";
    $uploadOk = 0;
// Check if $uploadOk is set to 0 by an error
if ($uploadOk == 0) {
    echo "Sorry, your file was not uploaded.";
// if everything is ok, try to upload file
} else {
    if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {
        echo "The file ". basename( $_FILES["fileToUpload"]["name"]). " has been uploaded.";
    } else {
        echo "Sorry, there was an error uploading your file.";

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