(PHP 8 >= 8.2.0)
Random\Engine\PcgOneseq128XslRr64::jump — Efficiently move the engine ahead multiple steps
Moves the algorithm’s state ahead by the number of steps given by advance, as if
Random\Engine\PcgOneseq128XslRr64::generate() was called that many times.
advance
The number of steps to move ahead; must be 0 or greater.
Es wird kein Wert zurückgegeben.
advance is less than 0,
a ValueError will be thrown.
Beispiel #1 Random\Engine\PcgOneseq128XslRr64::jump() example
<?php
$a = new \Random\Engine\PcgOneseq128XslRr64(0);
$b = clone $a;
for ($i = 0; $i < 1_000; $i++) {
$a->generate();
}
$b->jump(1_000);
echo "A: ", bin2hex($a->generate()), "\n";
echo "B: ", bin2hex($b->generate()), "\n";
?>Das oben gezeigte Beispiel erzeugt folgende Ausgabe:
A: e6d0d5813913a424 B: e6d0d5813913a424
Beispiel #2 Randomizer methods may call the engine more than once
<?php
$a = new \Random\Randomizer(new \Random\Engine\PcgOneseq128XslRr64(42659));
$b = new \Random\Randomizer(clone $a->engine);
$a->getInt(1, 1572864); // Performs two calls to generate().
$a->getInt(1, 1572864);
$b->engine->jump(2);
// Because the first call to ->getInt() called ->generate() twice
// the engines do not match up after performing a ->jump(2).
echo "A: ", bin2hex($a->engine->generate()), "\n";
echo "B: ", bin2hex($b->engine->generate()), "\n";
// Now the B engine matches the A engine.
echo "B: ", bin2hex($b->engine->generate()), "\n";
?>Das oben gezeigte Beispiel erzeugt folgende Ausgabe:
A: 1e9f3107d56653d0 B: a156c0086dd79d44 B: 1e9f3107d56653d0