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<?php
declare(strict_types=1);
namespace lucidtaz\minimax\engine;
use Closure;
/**
* Value object containing the result of a decision tree node evaluation
* These two concepts are used together so often that it warrants a separate
* class to be able to carry them around easily.
*/
class Evaluation
{
private const EPSILON = 0.00001;
* @var float Score that results from applying the decision
public $score;
* @var integer How deep in the execution tree this result was found. Higher
* means earlier. This is to prefer earlier solutions to later solutions
* with the same score, which will make the AI not delay a win without
* reason.
public $age;
public function isBetterThan(Evaluation $other): bool
if (abs($this->score - $other->score) < self::EPSILON) {
// Scores are considered the same, prefer earliest decision. (Shallowest node)
return $this->age > $other->age;
}
return $this->score > $other->score;
public static function getBestComparator(): Closure
return static function (Evaluation $a, Evaluation $b) {
return $a->isBetterThan($b) ? 1 : -1;
};
public static function getWorstComparator(): Closure
return $b->isBetterThan($a) ? 1 : -1;
LucidTaZ /
minimax
