Retwis ported to modern Redis data types.

The example (and related documentation at redis.io) was not updated for
5 years. Redis had no sorted sets and hashes when the original code was
written (!). An update was really needed.

We also use a modern PHP client now: Predis. A copy is shipped within
this repository to make life easier to newcomers trying Redis for the
first time via this example.

Predis/Command/ServerInfoV26x.php

@@ -0,0 +1,60 @@
+<?php
+
+/*
+ * This file is part of the Predis package.
+ *
+ * (c) Daniele Alessandri <suppakilla@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Predis\Command;
+
+/**
+ * @link http://redis.io/commands/info
+ * @author Daniele Alessandri <suppakilla@gmail.com>
+ */
+class ServerInfoV26x extends ServerInfo
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function parseResponse($data)
+    {
+        $info = array();
+        $current = null;
+        $infoLines = preg_split('/\r?\n/', $data);
+
+        if (isset($infoLines[0]) && $infoLines[0][0] !== '#') {
+            return parent::parseResponse($data);
+        }
+
+        foreach ($infoLines as $row) {
+            if ($row === '') {
+                continue;
+            }
+
+            if (preg_match('/^# (\w+)$/', $row, $matches)) {
+                $info[$matches[1]] = array();
+                $current = &$info[$matches[1]];
+                continue;
+            }
+
+            list($k, $v) = explode(':', $row);
+
+            if (!preg_match('/^db\d+$/', $k)) {
+                if ($k === 'allocation_stats') {
+                    $current[$k] = $this->parseAllocationStats($v);
+                    continue;
+                }
+
+                $current[$k] = $v;
+            } else {
+                $current[$k] = $this->parseDatabaseStats($v);
+            }
+        }
+
+        return $info;
+    }
+}