🎉 Hello world

day_1/part_2.php

@@ -0,0 +1,19 @@
+<?php
+
+$masses = explode(',', file_get_contents('input.txt'));
+
+function get_fuel_from_mass($mass)
+{
+    return floor($mass / 3) - 2;
+}
+
+echo array_sum(
+    array_map(function($mass) {
+        $total_fuel = 0;
+        while($mass > 0) {
+            $mass = max(get_fuel_from_mass($mass), 0);
+            $total_fuel += $mass;
+        }
+        return $total_fuel;
+    }, $masses)
+);