Add a PHP solution to problem 236

Author: rdtsc

src/moderate/beat-or-bit/solutions/php/solution.php

@@ -0,0 +1,25 @@
+#!/usr/bin/env php
+<?php
+
+$inputFile = new SplFileObject($argv[1]);
+
+$inputFile->setFlags(SplFileObject::READ_CSV   |
+                     SplFileObject::READ_AHEAD |
+                     SplFileObject::SKIP_EMPTY |
+                     SplFileObject::DROP_NEW_LINE);
+
+$inputFile->setCsvControl('|');
+
+foreach($inputFile as $values)
+{
+  array_walk($values, function(&$n)
+  {
+    $n = intval($n, 2);
+
+    $n ^= ($n >> 1);
+    $n ^= ($n >> 2);
+    $n ^= ($n >> 4);
+  });
+
+  echo join(' | ', $values), PHP_EOL;
+}