How can one ensure that the random number generator in PHP produces unique values each time?

To ensure that the random number generator in PHP produces unique values each time, you can use the `uniqid()` function in combination with `mt_rand()` to generate unique random numbers. By concatenating the unique identifier with the random number, you can create a more unique value. Additionally, you can store generated values in an array and check against it to avoid duplicates.

$uniqueValue = uniqid() . mt_rand();