What are common pitfalls when implementing a PHP counter on a website?

Common pitfalls when implementing a PHP counter on a website include not properly sanitizing user input, not handling concurrent requests correctly, and not securely storing the count data. To avoid these pitfalls, always sanitize user input to prevent SQL injection attacks, use locking mechanisms to handle concurrent requests, and store count data in a secure location. 

// Sanitize user input
$count = isset($_GET['count']) ? intval($_GET['count']) : 0;

// Use file locking to handle concurrent requests
$fp = fopen("counter.txt", "r+");
if (flock($fp, LOCK_EX)) {
    $count++;
    fseek($fp, 0);
    fwrite($fp, $count);
    flock($fp, LOCK_UN);
}
fclose($fp);

// Securely store count data
// Store count data in a secure location, such as a database or encrypted file

Keywords

PHP counter website implementation pitfalls

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