Add brainf_ck.php / riddle.php

1 files changed, 34 insertions, 0 deletions

diff --git a/riddle.php b/riddle.php
new file mode 100644
index 0000000..c9baa8b
--- /dev/null
+++ b/riddle.php
@@ -0,0 +1,34 @@
+<?php
+
+/*********************************************************
+ * This program displays a PHPer token.                  *
+ * Guess 'N'.                                            *
+ *                                                       *
+ * Hints:                                                *
+ * - N itself has no special meaning, e.g., 42, 8128,    *
+ *   it is selected at random.                           *
+ * - Each element of $token represents a single letter.  *
+ * - One letter consists of 5x5 cells.                   *
+ * - Remember, the output is a complete PHPer token.     *
+ *                                                       *
+ * License:                                              *
+ *   https://creativecommons.org/publicdomain/zero/1.0/  *
+ *********************************************************/
+const N = 0 /* Change it to your answer. */;
+assert(0 <= N && N <= 0b11111_11111_11111_11111_11111);
+
+$token = [
+  0x14B499C,
+  0x0BE34CC, 0x01C9C69,
+  0x0ECA069, 0x01C2449, 0x0FDB166, 0x01C9C69,
+  0x01C1C66, 0x0FC1C47, 0x01C1C66,
+  0x10C5858, 0x1E4E3B8, 0x1A2F2F8,
+];
+foreach ($token as $x) {
+  $x = $x ^ N;
+
+  $x = sprintf('%025b', $x);
+  $x = str_replace(search: ['0', '1'], replace: [' ', '#'], subject: $x);
+  $x = implode("\n", str_split($x, length: 5));
+  echo "{$x}\n\n";
+}