Implement day 19, in PHP.

2017/day-19/solution.php

@@ -0,0 +1,33 @@
+#!/usr/bin/php
+<?php
+
+$maze = file('php://stdin');
+
+$x = strpos($maze[0], '|');
+$y = 0;
+
+$dir = [0, 1];
+
+$path = '';
+$steps = 0;
+
+while ($maze[$y][$x] != ' ') {
+    if (ctype_alpha($maze[$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[1] = 0;
+        } else {
+            $dir[0] = 0;
+            $dir[1] = ($y + 1 >= count($maze) || $maze[$y + 1][$x] == ' ') ? -1 : 1;
+        }
+    }
+
+    $x += $dir[0];
+    $y += $dir[1];
+    $steps++;
+}
+
+echo $path . PHP_EOL;
+echo $steps . PHP_EOL;