Emonkak\Random

This library provides pseudo-random number generators and probability distributions.

Requirements

• PHP 7.1 or higher

Licence

MIT Licence

Example

use Emonkak\Random\Engine\MT19937Engine;
use Emonkak\Random\Distribution\NormalDistribution;

$seed = 100;  // Initial seed
$engine = new MT19937Engine($seed);  // 32bit Mersenne Twister engine
$distribution = new NormalDistribution(0, 1);  // Standard normal distribution

// Generate a random number with the normal distribution.
$distribution->generate($engine);

Engine

• KnuthBEngine

• LinearCongruentialEngine

• MinstdRand0Engine

• MinstdRandEngine

• MT19937Engine

  The random generator engine according to Mersenne Twister. It is full-compatible to the built-in mt_rand().

   // Also, the initial seed algorithm is full-compatible to the built-in `mt_srand()`
   $engine = new MT19937Engine(/* $seed */);
  
   // Get a next random number from the current generator state.
   $number = $engine->next();  // as int
   $number = $engine->nextDouble();  // as float
  
   // Get the minimum and maximum number which generate a value by the engine.
   $minimum = $engine->min();
   $maximum = $engine->max();
  
   // Iterate the generator engine.
   foreach (new LimitIterator($engine, 0, 100) as $n) {
   }

• MTRandWrapper

  The wrapper for the built-in mt_rand().

• ShuffleOrderEngine

• XorShift128Engine

  The random generator engine according to Xorshift 128 bit algorithm.

Distribution

• BernoulliDistribution
• BinomialDistribution
• DiscreteDistribution
• DistributionIterator
• ExponentialDistribution
• GammaDistribution
• GeometricDistribution
• LogNormalDistribution
• NormalDistribution
• PiecewiseConstantDistribution
• PiecewiseLinerDistribution
• UniformIntDistribution
• UniformRealDistribution