Advent of Code 2015 - Day 2 Exercise 1

2-1.php

<?php
$totalPaper = 0;
function howMuchPaper($dimension) {

$dimensions = Array();
$dimensions = explode("x",$dimension);
$length = $dimensions[0];
$width = $dimensions[1];
$height = $dimensions[2];
$side1 = $length * $width;
$side2 = $width * $height;
$side3 = $length * $height;
$smallestSide = min($side1, $side2, $side3);
$paperNeeded = (2 * $side1) + (2 * $side2) + (2 * $side3);
$paperNeeded = $paperNeeded + $smallestSide;
return intval($paperNeeded);
}

$handle = @fopen("/home/arthur/adventcode/presents.txt", "r");
if ($handle) {
    while (($buffer = fgets($handle, 4096)) !== false) {
        $totalPaper = $totalPaper + howMuchPaper($buffer);
    }
    if (!feof($handle)) {
        echo "Error: unexpected fgets() fail\n";
    }
    fclose($handle);
}
echo "Total Paper is " . $totalPaper;