What is the potential security risk of using extract($_POST) and extract($_GET) in PHP scripts?

Using `extract($_POST)` and `extract($_GET)` in PHP scripts can pose a potential security risk as it can extract and create variables from user input without validation, potentially leading to variable overwrite or injection attacks. To mitigate this risk, it is recommended to manually retrieve and validate specific input variables from `$_POST` and `$_GET` arrays. 

// Example of manually retrieving and validating input variables from $_POST
$username = isset($_POST['username']) ? $_POST['username'] : '';
$password = isset($_POST['password']) ? $_POST['password'] : '';

// Example of manually retrieving and validating input variables from $_GET
$id = isset($_GET['id']) ? $_GET['id'] : '';

Keywords

security risk extract $_POST $_GET PHP scripts

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