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