What are the potential pitfalls of updating a download count in PHP when a user clicks on a download link?

One potential pitfall of updating a download count in PHP when a user clicks on a download link is that it can be easily manipulated by the user, leading to inaccurate download counts. To solve this issue, you can implement a server-side validation to ensure that the download count is only incremented once per unique user. 

<?php
session_start();

if (!isset($_SESSION['downloaded'])) {
    // Increment download count
    $downloadCount = // Retrieve download count from database
    $downloadCount++;
    
    // Update download count in database
    // Code to update download count in database goes here
    
    // Set session variable to prevent multiple increments
    $_SESSION['downloaded'] = true;
}
?>

Keywords

SQL injection race condition session hijacking CSRF attack data inconsistency

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