What are the potential security risks associated with using extract() function in PHP for handling form data?

Using the extract() function in PHP for handling form data can pose security risks such as potential variable injection attacks or overwriting existing variables unintentionally. To mitigate these risks, it's recommended to manually assign form data to variables using $_POST or $_GET superglobals instead of using extract(). 

// Assign form data to variables manually
$username = isset($_POST['username']) ? $_POST['username'] : '';
$password = isset($_POST['password']) ? $_POST['password'] : '';
$email = isset($_POST['email']) ? $_POST['email'] : '';

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security risks extract() function PHP form data handling

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