Online PHP editor | rfc for 8YRRt

@ 2025-09-07T16:34:45Z

<?php

$pool = [
    1703 => 15916.19738,
    5129 => 11799.15419,
    33   => 11173.49945,
    1914 => 8439.45987,
    2291 => 6284.22271,
    5134 => 5963.14065,
    5509 => 5169.85755,
    4355 => 5153.80867,
    2078 => 3932.79341,
    31   => 3924.09928,
    5433 => 2718.7711,
    3172 => 2146.1932,
    1896 => 2141.36021,
    759  => 1453.5501,
    2045 => 1320.74681,
    5873 => 1222.7448,
    2044 => 1194.4903,
    6479 => 1074.1714,
    5299 => 950.872,
    3315 => 878.06602,
    6193 => 847.3372,
    1874 => 813.816,
    1482 => 330.6422,
    6395 => 312.1545,
    6265 => 165.9224,
    6311 => 122.8785,
    6288 => 26.5426,
];

function balanceTeams(array $pool, int $maxTrades = 10): array
{
    arsort($pool);
    $teams = [[], []];
    $i = 1;
    foreach ($pool as $k => $v) {
        $teams[$i = 1 - $i][$k] = $v;
    }

    $getDiff = fn($a, $b) => array_sum($a) - array_sum($b);

    for ($i = 0; $i < $maxTrades; ++$i) {
        $diff = $getDiff(...$teams);
        //echo "Diff: $diff\n";
        if (!$diff) {
            break;
        }

        foreach ($teams[0] as $idA => $valA) {
            foreach ($teams[1] as $idB => $valB) {
                if (abs($valA - $valB) < abs($diff)) {
                    $teams[0][$idB] = $valB;
                    $teams[1][$idA] = $valA;
                    unset($teams[0][$idA], $teams[1][$idB]);
                    arsort($teams[0]);
                    arsort($teams[1]);
                    //printf("Trade %d: %s for %s\n", $i + 1, $idA, $idB);
                    continue 3;
                }
            }
        }
        break;
    }

    return $teams;
}

$teams = balanceTeams($pool);
var_export($teams);

printf(
    "Summary:\nAverage: %f\nTeam1 Sum: %f\nTeam2 Sum: %f",
    array_sum($pool) / 2,
    array_sum($teams[0]),
    array_sum($teams[1])
);

Output for git.master_jit, git.master: array ( 0 => array ( 5129 => 11799.15419, 33 => 11173.49945, 5134 => 5963.14065, 5509 => 5169.85755, 2078 => 3932.79341, 5433 => 2718.7711, 3172 => 2146.1932, 2045 => 1320.74681, 2044 => 1194.4903, 5299 => 950.872, 6193 => 847.3372, 1482 => 330.6422, 6265 => 165.9224, 6288 => 26.5426, ), 1 => array ( 1703 => 15916.19738, 1914 => 8439.45987, 2291 => 6284.22271, 4355 => 5153.80867, 31 => 3924.09928, 1896 => 2141.36021, 759 => 1453.5501, 5873 => 1222.7448, 6479 => 1074.1714, 3315 => 878.06602, 1874 => 813.816, 6395 => 312.1545, 6311 => 122.8785, ), )Summary: Average: 47738.246250 Team1 Sum: 47739.963060 Team2 Sum: 47736.529440

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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