What are some common pitfalls when using PHP to include files and variables in navigation?

One common pitfall when using PHP to include files and variables in navigation is not properly sanitizing user input, which can lead to security vulnerabilities such as code injection. To solve this issue, always sanitize user input before using it in file includes or variable assignments. 

// Example of sanitizing user input before including files
$allowed_pages = ['home', 'about', 'services', 'contact'];

if (isset($_GET['page']) && in_array($_GET['page'], $allowed_pages)) {
    $page = $_GET['page'];
    include "pages/{$page}.php";
} else {
    include "pages/home.php";
}

Keywords

PHP include variables navigation errors

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