What are common pitfalls when working with sessions and file uploads in PHP?

One common pitfall when working with sessions and file uploads in PHP is not properly handling the file upload before starting the session. This can lead to issues with session data being lost or corrupted during the file upload process. To solve this, make sure to handle the file upload before starting the session to ensure that the session data is preserved. 

<?php
// Handle file upload before starting the session
if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_FILES['file'])) {
    // Process file upload logic here
}

// Start the session after handling file upload
session_start();
?>

Keywords

sessions file uploads PHP security vulnerabilities error handling

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