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Some PHP helpers classes about chess rating.

Rating Calculator

<?php

    use ChessRatingTools\RatingCalculator;

    $games = [[2100 => 1], [2050 => 0.5], [0 => 1]]; // [opponent's rating => result]
    $myRating = 2100;
    $k = 20; // K is the development coefficient, http://www.fide.com/component/handbook/?id=172&view=article Point: 8.56.

    $calculator = new RatingCalculator($games, $myRating, $k);

    echo $calculator->changeRating();
    echo $calculator->basicPerformance();
    echo $calculator->unratedPlayerRating();

?>

Fide Rating File XML Parser

<?php

    use ChessRatingTools\FideXmlReader;
    
    $reader = new  FideXmlReader('./players_list_xml.xml');
    
    // All players with name like '*Carlsen*'
    $carlsens = $reader->searchByName('Carlsen');
    
    // Search a player by ID
    $kasparov = $reader->searchById('4100018');
    
    // Search by multiples IDs
    $players = $reader->searchByIds(['4100018', '123456']);
    
    // Players with > 2700 rating
    foreach ($reader->getPlayers() as $player) {
        if ($player['rating'] > 2700) {
            printf("%s [%d]\n", $player['name'], $player['rating']);
        }
    }
?>

Feda Rating CSV File Parser

You can create The file .csv saving the first page of feda.xls. Download from: http://www.feda.org/web/index.php/elo

<?php

    use ChessRatingTools\FedaCsvReader;
    
    $reader = new FedaCsvReader('./feda_201509.csv');
    
    // Search a player by ID
    $player = $reader->searchById(12345);
?>