Edit Report a Bug

    Random\Engine\PcgOneseq128XslRr64::__construct

    (PHP 8 >= 8.2.0)

    Random\Engine\PcgOneseq128XslRr64::__construct — Constructs a new PCG Oneseq 128 XSL RR 64 engine

    说明

    public Random\Engine\PcgOneseq128XslRr64::__construct(string|int|null $seed = null)

    警告

    本函数还未编写文档，仅有参数列表。

    参数

    seed

    How the internal 128 bit (16 byte) state consisting of one unsigned 128 bit integer is seeded depends on the type used as the seed.

    Type 说明
    null Fills the state with 16 random bytes generated using the CSPRNG.
    int Fills the state by setting the state to 0, advancing the engine one step, adding the value of seed interpreted as an unsigned 64 bit integer, and advancing the engine another step.
    string Fills the state by interpreting a 16 byte string as a little-endian unsigned 128 bit integer.

    错误／异常

    示例

    示例 #1 Random\Engine\PcgOneseq128XslRr64::__construct() example

    <?php
    // Uses a random 128 Bit seed.
    $e = new \Random\Engine\PcgOneseq128XslRr64();

    $r = new \Random\Randomizer($e);
    ?>

    示例 #2 Deriving a seed from a string

    <?php
    $string     = "My string seed";

    // Hash the string with truncated SHA-256 using binary output
    // to turn the $string into a 128 Bit seed. Using the same
    // string will result in the same sequence of randomness.
    $e = new \Random\Engine\PcgOneseq128XslRr64(
    substr(hash('sha256', $string, binary: true), 0, 16)
    );

    echo     bin2hex($e->generate()), "\n";
    ?>

    以上示例会输出：

    8333ef59315b16d8
    add a note add a note

    User Contributed Notes

    There are no user contributed notes for this page.
    To Top