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    Random\Engine\Xoshiro256StarStar::jump

    (PHP 8 >= 8.2.0)

    Random\Engine\Xoshiro256StarStar::jump — Efficiently move the engine ahead by 2^128 steps

    说明

    public Random\Engine\Xoshiro256StarStar::jump(): void

    Moves the algorithm’s state ahead by 2128 steps, as if Random\Engine\Xoshiro256StarStar::generate() was called 2128 times.

    The purpose of a jump is to facilitate the creation of a new Random\Engine\Xoshiro256StarStar engine from an existing seeded Random\Engine\Xoshiro256StarStar engine. The seeded engine acts as a blueprint, which can be cloned and repeatedly jumped to create 2128 non-overlapping sequences with 2128 values each.

    参数

    此函数没有参数。

    返回值

    没有返回值。

    示例

    示例 #1 Random\Engine\Xoshiro256StarStar::jump() example

    <?php
    use Random\Engine\Xoshiro256StarStar;
    use     Random\Randomizer;

    $blueprintRng = new Xoshiro256StarStar(0);

    $fibers = [];
    for (    $i = 0; $i < 8; $i++) {
    $fiberRng = clone $blueprintRng;
    $blueprintRng->jump();

    $fiber = new Fiber(static function () use ($fiberRng, $i): void {
    $randomizer = new Randomizer($fiberRng);

    while (    true) {
    Fiber::suspend();

    echo     "{$i}: ", $randomizer->getInt(0, 100), "\n";
    }
    });
    $fiber->start();

    $fibers[] = $fiber;
    }

    // Even though the fibers execute in a random order, they will print the same value
    // each time, because each has its own unique instance of the RNG.
    $randomizer = new Randomizer();

    $fibers = $randomizer->shuffleArray($fibers);
    foreach (    $fibers as $fiber) {
    $fiber->resume();
    }

    $fibers = $randomizer->shuffleArray($fibers);
    foreach (    $fibers as $fiber) {
    $fiber->resume();
    }
    ?>

    以上示例的输出类似于：

    4: 89
3: 10
2: 63
1: 75
6: 41
5: 56
0: 16
7: 60
7: 34
6: 58
1: 74
4: 63
3: 3
5: 42
2: 45
0: 86

    参见

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