From bbf8ad85e45bfa5846ba0d7a2f74a4e9fb81d3de Mon Sep 17 00:00:00 2001
From: Bert Peters <bert@bertptrs.nl>
Date: Tue, 19 Dec 2017 10:16:24 +0100
Subject: [PATCH] Slightly simpler bounds check.

---
 2017/day-19/solution.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/2017/day-19/solution.php b/2017/day-19/solution.php
index 3f19dea..4207e56 100755
--- a/2017/day-19/solution.php
+++ b/2017/day-19/solution.php
@@ -16,11 +16,11 @@ while ($maze[$y][$x] != ' ') {
         $path .= $maze[$y][$x];
     } elseif ($maze[$y][$x] == '+') {
         if ($dir[0] == 0) {
-            $dir[0] = ($x + 1 >= strlen($maze[$y]) || $maze[$y][$x + 1] == ' ') ? -1 : 1;
+            $dir[0] = ($x == 0 || $maze[$y][$x - 1] == ' ') ? 1 : -1;
             $dir[1] = 0;
         } else {
             $dir[0] = 0;
-            $dir[1] = ($y + 1 >= count($maze) || $maze[$y + 1][$x] == ' ') ? -1 : 1;
+            $dir[1] = ($y == 0 || $maze[$y - 1][$x] == ' ') ? 1 : -1;
         }
     }