Is uniqid() a suitable function for generating activation codes in PHP?

Using uniqid() alone may not be the best option for generating activation codes in PHP, as it may not always produce unique codes, especially in high traffic scenarios. To ensure uniqueness, it's better to combine uniqid() with other methods such as hashing or randomization. One common approach is to concatenate uniqid() with a random string generated using functions like md5() or sha1().

$activationCode = uniqid() . md5(random_bytes(10));