What are the best practices for passing variables in PHP forms?

When passing variables in PHP forms, it is best practice to use the POST method to securely send data from the form to the server. This helps prevent sensitive information from being visible in the URL and provides a more secure way to transmit data. 

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

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

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

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