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<?php
namespace Savvot\Random;
/**
* Proof-of-concept that md5 hash is uniformly distributed and can be used as PRNG source
* Pretty fast, simple and straightforward generator
*
* @package Savvot\Random
* @author SavvoT <[email protected]>
*/
class HashRand extends AbstractRand
{
* This is 63bit generator because PHP does not support unsigned 64bit int
const INT_MAX = 0x7FFFFFFFFFFFFFFF;
* @inheritdoc
public function randomInt()
$hash = md5($this->hashedSeed . $this->state++, true);
$num = unpack('V*', $hash);
// Create two 64bit numbers from four 32bit int and xor them
return (($num[2] << 32 | $num[1]) ^ ($num[4] << 32 | $num[3])) & self::INT_MAX;
}
protected function init()
$this->state = 0;
savvot /
random
