What is the purpose of using unset() on $_POST or $_GET variables in PHP?

When working with sensitive information passed through forms using $_POST or $_GET variables in PHP, it is important to unset these variables once they have been processed to prevent any potential security risks such as data leakage or manipulation. By using unset() on these variables, we can ensure that the data is no longer accessible after it has been used, reducing the risk of unauthorized access to the information. 

// Process the form data
$username = $_POST['username'];
$password = $_POST['password'];

// Unset the $_POST variables after processing
unset($_POST['username']);
unset($_POST['password']);

Keywords

unset $_POST $_GET variables PHP

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