start a restructure

Behavioral/Strategy/IdComparator.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace DesignPatterns\Strategy;
+
+/**
+ * Class IdComparator
+ */
+class IdComparator implements ComparatorInterface
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function compare($a, $b)
+    {
+        if ($a['id'] == $b['id']) {
+            return 0;
+        } else {
+            return $a['id'] < $b['id'] ? -1 : 1;
+        }
+    }
+}