Random\Engine\Xoshiro256StarStar::__construct
(PHP 8 >= 8.2.0)
Random\Engine\Xoshiro256StarStar::__construct — Constructs a new xoshiro256** engine
Descrizione
Avviso
Questa funzione, al momento non è documentata; è disponibile soltanto la lista degli argomenti.
Elenco dei parametri
-
seed -
How the internal 256 bit (32 byte) state consisting of four unsigned 64 bit integers is seeded depends on the type used as the
seed.Type Descrizione null Fills the state with 32 random bytes generated using the CSPRNG. int Fills the state with four consecutive values generated with the SplitMix64 algorithm that was seeded with seedinterpreted as an unsigned 64 bit integer.string Fills the state by interpreting a 32 byte string as four little-endian unsigned 64 bit integers.
Errori/Eccezioni
-
If the length of a string
seedis not 32 bytes, a ValueError will be thrown. -
If a string
seedconsists of 32 NUL bytes ("\x00"), a ValueError will be thrown.
Esempi
Example #1 Random\Engine\Xoshiro256StarStar::__construct() example
<?php
// Uses a random 256 Bit seed.
$e = new \Random\Engine\Xoshiro256StarStar();
$r = new \Random\Randomizer($e);
?>Example #2 Deriving a seed from a string
<?php
$string = "My string seed";
// Hash the string with SHA-256 using binary output to turn the
// $string into a 256 Bit seed. Using the same string will result
// in the same sequence of randomness.
$e = new \Random\Engine\Xoshiro256StarStar(
hash('sha256', $string, binary: true)
);
echo bin2hex($e->generate()), "\n";
?>Il precedente esempio visualizzerà:
6e013453678388c2
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