(PHP 8 >= 8.2.0)
Random\Engine\Xoshiro256StarStar::jump — Efficiently move the engine ahead by 2^128 steps
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.
This function has no parameters.
No value is returned.
Example #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();
}
?>The above example will output something similar to:
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