Taeluf.com

part1

#!/usr/bin/env php
<?php
/**
 * Add the game ids where 12 red cubese, 13 green cubes, & 14 blue cubes is enough to satisfy the game
 */

//$input = file_get_contents(__DIR__.'/sample.txt');
$input = file_get_contents(__DIR__.'/input.txt');

$game_lines = explode("\n", trim($input));

// 12 red cubes, 13 green cubes, and 14 blue cubes
$max = [
    'red'=>12,
    'green'=>13,
    'blue'=>14,
];

$total = 0;

foreach ($game_lines as $line){
    $game_parts = explode(": ", $line);
    $rounds_text = $game_parts[1];
    $game_num = explode(" ",$game_parts[0])[1];

    $rounds = explode('; ', $rounds_text);
    // each round is like: 1 red, 10 blue, 5 green
    $can_add_game = true;
    foreach ($rounds as $round){
        $results = explode(", ", $round);
        foreach ($results as $result){
            $parts = explode(" ", $result);
            $color = $parts[1];
            $amount = $parts[0];
            if ($amount > $max[$color])continue 3;
        }
    }
    if ($can_add_game)$total += $game_num;
}

echo "Sum of Game IDs: $total\n";