Day 2 solution.

2015/solutions.php

@@ -5,6 +5,15 @@ foreach ($days as $day) {
   require($day);
 }
 
-$d1 = day1solution1();
-$d1b = day1solution1b();
+$solutions = [];
+$solutions['day_1']['part_1'] = day1solution1();
+$solutions['day_1']['part_2'] = day1solution1b();
+$solutions['day_2']['part_1'] = day2part1();
+$solutions['day_2']['part_2'] = day2part1b();
 
+// OUTPUT THE SOLUTIONS WE HAVE.
+foreach ($solutions as $day => $parts) {
+  foreach ($parts as $part => $answer) {
+    echo "*** The answer to $day $part is: $answer ***\n";
+  }
+}