Advent of Code 2023 - day 2

day2.php

<?php
declare(strict_types=1);

$input = file('input.txt', FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);

$maxRed = 12;
$maxGreen = 13;
$maxBlue = 14;

$validCount = 0;
$sumOfGameIds = 0;
$sumOfGamePowers = 0;
foreach ($input as $line) {
    $gameInfo = getGameInfo($line);
    /*if (isGamePossible($gameInfo, $maxRed, $maxGreen, $maxBlue)) {
        $sumOfGameIds += key($gameInfo);
        $validCount++;
    }*/
    $gamePower = getGamePower($gameInfo);
    $sumOfGamePowers += $gamePower;
}

/*printf('Processed %d games, but only %d were possible with given restrictions, and the sum of game ids was %d.' . PHP_EOL,
    count($input),
    $validCount,
    $sumOfGameIds
);*/

printf('Processed %d games, by their powers combined we got %s' . PHP_EOL, count($input), $sumOfGamePowers);

function getGamePower(array $gameInfo): int
{
    $gamePower = 1;
    $highestGreen = 0;
    $highestBlue = 0;
    $highestRed = 0;
    foreach ($gameInfo as $id => $games) {
        foreach ($games as $game) {
            $highestGreen = max($highestGreen, $game['green'] ?? 0);
            $highestBlue = max($highestBlue, $game['blue'] ?? 0);
            $highestRed = max($highestRed, $game['red'] ?? 0);
        }
    }

    return $highestRed * $highestBlue * $highestGreen;
}
function getGameInfo(string $line): array
{
    $gameInfo = [];
    $gameId = intval(str_replace('Game ', '', $line));
    $games = explode(';', substr($line, strpos($line, ':') + 1));
    foreach ($games as $game) {
        $grabs = explode(',', $game);
        $singleGameInfo = [];
        foreach ($grabs as $grab) {
            $numAndColour = explode(' ', trim($grab));
            $singleGameInfo[$numAndColour[1]] = $numAndColour[0];
        }
        $gameInfo[$gameId][] = $singleGameInfo;
    }

    return $gameInfo;
}

function isGamePossible(array $gamesInfo, int $maxRed, int $maxGreen, int $maxBlue): bool
{
    foreach ($gamesInfo as $id => $games) {
        foreach ($games as $game) {
            if (($game['green'] ?? 0) > $maxGreen ||
                ($game['red'] ?? 0) > $maxRed ||
                ($game['blue'] ?? 0) > $maxBlue
            ) {
                return false;
            }
        }
    }

    return true;
}


function dd($a, $b = null, $c = null, $d = null) {
    die(var_dump($a, $b, $c, $d));
}