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<?php
namespace DaanMooij\AdventOfCode\Year2015\Day2;
use Exception;
use DaanMooij\AdventOfCode\Day;
use DaanMooij\AdventOfCode\Year2015\Day2\Present;
class Day2 implements Day
{
/** @var array<string> */
private array $dimensions = [];
/** @return void */
public function loadInput(): void
$filepath = __DIR__ . "/input.txt";
$file = file($filepath);
if (!is_array($file)) {
throw new Exception("Could not open input file: {$filepath}");
}
$this->dimensions = $file;
public function solve(): void
$amountWrappingPaper = 0;
$lengthRibbon = 0;
foreach ($this->dimensions as $dimension) {
$present = Present::fromString($dimension);
$amountWrappingPaper += $present->getSurfaceArea();
$amountWrappingPaper += $present->getSmallestSideArea();
$lengthRibbon += $present->getVolume();
$lengthRibbon += $present->getSmallestSide() * 2;
$lengthRibbon += $present->getSecondSmallestSide() * 2;
printf("The total amount of wrapping paper is: %s\n", $amountWrappingPaper);
printf("The total length of ribbon is: %s\n", $lengthRibbon);
/** @return array<string> */
public function getDimensions(): array
return $this->dimensions;
daanmooij /
advent-of-code-php
