How can a progress bar for file uploads be implemented in PHP?

To implement a progress bar for file uploads in PHP, you can use the `$_SESSION` variable to store the progress of the upload and update it using AJAX calls. You can then use this progress value to update the progress bar on the front end. 

<?php
session_start();

if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_FILES['file'])) {
    $file = $_FILES['file'];
    
    // Handle file upload logic here
    
    // Update progress in session variable
    $_SESSION['upload_progress'] = ($file['size'] / $file['size']) * 100;
    
    echo json_encode(['progress' => $_SESSION['upload_progress']]);
    exit;
}
?>

Keywords

file uploads progress bar PHP implementation AJAX

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