In the context of PHP, how does unsetting variables like $_SESSION['formular_daten'] help in maintaining data integrity and preventing data leakage?

When working with sensitive data in PHP, it's important to unset variables like $_SESSION['formular_daten'] after they are no longer needed to prevent data leakage and maintain data integrity. This helps to ensure that sensitive information is not accessible once it is no longer required, reducing the risk of unauthorized access to the data.

// Unset the session variable after it is no longer needed
unset($_SESSION['formular_daten']);