The debug info seems to output 2 64 bit states, hex encoded:
<?php
// Uses a random 128 Bit seed.
$e = new \Random\Engine\PcgOneseq128XslRr64(2);
$r = new \Random\Randomizer($e);
print_r($e->__debugInfo());
echo $e->generate();
?>
Array
(
[__states] => Array
(
[0] => 412fcfd8d398338f
[1] => 24321d78e5482b33
)
)
٤U٤Ԁ