akondas/chess.php

chess.php is a PHP chess library that is used for chess move generation/validation, piece placement/movement, and check/checkmate/stalemate detection

v1.0.5 2019-01-28 22:14 UTC

Requires

• php: ^7.2
• ext-json: *

Requires (Dev)

• friendsofphp/php-cs-fixer: ^2.14
• johnkary/phpunit-speedtrap: ^3.0
• phpbench/phpbench: ^0.15.0
• phpstan/phpstan: ^0.11.1
• phpunit/phpunit: ^7.5

MIT

• ryan hs
• Arkadiusz Kondas

README

chess.php is a PHP chess library that is used for chess move generation/validation, piece placement/movement, and check/checkmate/stalemate detection - basically everything but the AI.

NOTE: this is a port of chess.js for php, froked from ryanhs/chess.php

Installation

use composer with composer require akondas/chess.php
or put in your composer.json

"require": {
	"ryanhs/chess.php": "^1.0"
}

Example Code

The code below plays a complete game of chess ... randomly.

<?php

require 'vendor/autoload.php';
use \Ryanhs\Chess\Chess;

$chess = new Chess();
while (!$chess->gameOver()) {
	$moves = $chess->moves();
	$move = $moves[mt_rand(0, count($moves) - 1)];
	$chess->move($move);
}

echo $chess->ascii() . PHP_EOL;

   +------------------------+
 8 | .  .  .  .  .  .  .  . |
 7 | .  .  .  .  r  .  .  . |
 6 | .  .  .  .  .  .  .  . |
 5 | .  .  .  .  .  .  .  . |
 4 | k  .  .  .  .  .  .  . |
 3 | .  .  .  .  .  .  K  . |
 2 | .  .  .  n  .  .  .  . |
 1 | .  .  .  .  .  .  .  . |
   +------------------------+
     a  b  c  d  e  f  g  h

Performance

There is still a lot to do in this topic.
akondas/php-grandmaster is a good place to start experiment ;)

Chess::move()

iteration	mean	comment
1	548.819μs	initial
2	447.973μs	replace fen with json_encode in history position (inThreefoldRepetition cache)
3	340.375μs	replace fen with json_encode in generateMoves
4	333.145μs	add boardHash calculation on make/undo move
5	25.917μs	🔥 add cache for moveToSAN method