What are the potential pitfalls of passing variables through links in PHP?

Passing variables through links in PHP can expose your application to security risks such as injection attacks or data manipulation. To mitigate these risks, it is recommended to sanitize and validate the input data before using it in your application.

// Sanitize and validate the input data before passing it through links
$variable = filter_var($_GET['variable'], FILTER_SANITIZE_STRING);