What are the potential security risks associated with using GET method for passing variables in PHP?

Using the GET method to pass variables in PHP can expose sensitive information in the URL, making it easier for attackers to intercept and manipulate the data. To mitigate this risk, it is recommended to use the POST method instead, which sends data in the request body rather than in the URL.

<form method="post" action="process.php">
    <input type="text" name="username">
    <input type="password" name="password">
    <button type="submit">Submit</button>
</form>
```

In the "process.php" file, you can access the variables using the $_POST superglobal:

```php
$username = $_POST['username'];
$password = $_POST['password'];