What best practice should be followed to ensure unique passwords are generated in the PHP code snippet?

To ensure unique passwords are generated in the PHP code snippet, it is important to use a secure method to generate random strings. One common approach is to use the `random_bytes` function in PHP, which generates cryptographically secure pseudo-random bytes. By using this function, we can create a unique password that is difficult to predict.

$random_bytes = random_bytes(16);
$unique_password = bin2hex($random_bytes);