public uuid () Generates a v4 random UUID (Universally Unique IDentifier) The version 4 UUID is purely random (except the version)

public bytes ([mixed $len]) Generates a random binary string The Random::bytes method returns a string

public base58 ([mixed $n]) Generates a random base58 string If $len is not specified, 16 is assumed. It may be larger

public base64 ([mixed $len]) Generates a random base64 string If $len is not specified, 16 is assumed. It may be larger

public hex ([mixed $len]) Generates a random hex string If $len is not specified, 16 is assumed. It may be larger

public number (mixed $len) Generates a random number between 0 and $len Returns an integer: 0 <= result <= $len

public base64Safe ([mixed $len], [mixed $padding]) Generates a random URL-safe base64 string If $len is not

Source