<?php /* * * @copyright (c) 2009 animegame.eu * @license http://www.gnu.org/licenses/gpl-3.0.html GNU General Public Licence * */ /** * Calculates the elo value out of the given parameters * @param int ownElo the own elo value * @param int otherElo the others elo value * @param int result the result (4:1 = 3, 2:3 = -1) * @param int maxResult the maximum value result can have */ function calculateElo($ownElo, $otherElo, $result, $maxResult) { $erw = 1 / (1 + pow(10, ($otherElo - $ownElo)/400)); $sw = ($result + $maxResult) / ($maxResult * 2) ; return round($ownElo + 50 * ($sw - $erw)); } /* echo calculateElo(1000, 1000, 5, 5) . '<br>'; echo calculateElo(1000, 1000, -5,5) . '<br>'; echo calculateElo(900,1100,5,5) . '<br>'; echo calculateElo(900,1100,-5,5) . '<br>'; echo calculateElo(1100,900,5,5) . '<br>'; echo calculateElo(1100,900,-5,5) . '<br>'; echo calculateElo(2000,500,5,5) . '<br>'; echo calculateElo(2000,500,-5,5) . '<br>'; for($i=1000;$i<2000;$i++) { if($i == calculateElo($i, 1000, 5, 5)) { echo 'ranking that does not provide points against 1000 is ' .$i . '<br>'; break; } } */ ?>