What are the potential pitfalls of using PHP for URL rewriting?

One potential pitfall of using PHP for URL rewriting is the risk of introducing security vulnerabilities such as code injection or allowing access to sensitive files. To mitigate this risk, it is important to properly sanitize and validate user input before using it to dynamically generate URLs. 

// Sanitize and validate user input before using it for URL rewriting
$url = filter_input(INPUT_GET, 'url', FILTER_SANITIZE_URL);

if ($url !== false) {
    // Rewrite the URL using the sanitized input
    // Example: header("Location: " . $url);
} else {
    // Handle invalid input
    // Example: header("Location: error.php");
}

Keywords

PHP URL rewriting mod_rewrite htaccess regular expressions

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