The Game of Life in PHP

GameOfLife.php

<?php
/**
 * The Game of Life - a PHP simulator of the famous game.
 * Early development state.
 *
 * Copyright 2011 Martin Srank (http://smasty.net)
 *
 * This source file is subject to the MIT license:
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the „Software“), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is furnished
 * to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED „AS IS“, WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 */


// Glider
$game = new GameOfLife(41);
$game->table[3][5] = 1;
$game->table[4][5] = 1;
$game->table[5][5] = 1;
$game->table[4][3] = 1;
$game->table[5][4] = 1;

echo $game->runSimulation(1000, 25);



/**
 * The Game of Life
 */
class GameOfLife {


	public $table, $table2 = array();

	private $size = 48;


	public function __construct($size = null){
		if($size !== null)
			$this->size = $size;

		$this->createTable($size);
	}


	public function createTable($size){
		for($i = 1; $i <= $size; $i++)
			for($j = 1; $j <= $size; $j++)
				$this->table[$i][$j] = $this->table2[$i][$j] = 0;
	}


	public function nextCellState($x, $y){
		$cell = $this->table[$x][$y];
		$neighbours = 0;
		for($i = $x-1; $i <= $x+1; $i++)
			for($j = $y-1; $j <= $y+1; $j++)
				if($this->table[$this->coord($i)][$this->coord($j)] == 1 && !($i == $x && $j == $y))
					$neighbours++;

		if($cell)
			return ($neighbours == 2 || $neighbours == 3) ? 1 : 0;
		else
			return ($neighbours == 3) ? 1 : 0;
	}


	public function paintState(){
		for($i = 1; $i <= $this->size; $i++){
			for($j = 1; $j <= $this->size; $j++)
				echo (bool) $this->table[$i][$j] ? "x" : " ";
			echo "\n";
		}
	}


	public function regenerate(){
		for($i = 1; $i <= $this->size; $i++)
			for($j = 1; $j <= $this->size; $j++)
				$this->table2[$i][$j] = $this->nextCellState($i, $j);

		$this->table = $this->table2;
	}


	public function runSimulation($generations, $delay = 200){

		for($n = 1; $n <= $generations; $n++){
			$this->paintState();
			usleep($delay * 1e3);
			$this->regenerate();
		}
	}


	public function coord($n){
		if($n == 0) return $this->size;
		if($n == $this->size+1) return 1;
		return $n;
	}

}