What are the best practices for displaying upload progress using PHP?

To display upload progress using PHP, you can utilize the $_SESSION variable to store the progress and update it as the file is being uploaded. You can then use AJAX to periodically fetch the progress from the server and display it to the user in real-time. 

```php
<?php
session_start();

if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_FILES['file'])) {
    $file = $_FILES['file'];
    $targetDir = 'uploads/';
    $targetFile = $targetDir . basename($file['name']);
    
    move_uploaded_file($file['tmp_name'], $targetFile);
}

if (isset($_SESSION['upload_progress'])) {
    echo $_SESSION['upload_progress'];
} else {
    echo '0';
}
?>
```

In this code snippet, we first start a session to store the upload progress. We then check if a file is being uploaded, move it to a designated directory, and update the progress in the session. Finally, we check and output the upload progress when requested by the client using AJAX.

Keywords

AJAX file upload progress bar $_FILES session variables

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