EduardoGR adding strategy context in order to complete the pattern

Behavioral/Strategy/Context.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace DesignPatterns\Behavioral\Strategy;
+
+class Context
+{
+    /**
+     * @var ComparatorInterface
+     */
+    private $comparator;
+
+    public function __construct(ComparatorInterface $comparator)
+    {
+        $this->comparator = $comparator;
+    }
+
+    public function executeStrategy(array $elements) : array
+    {
+        uasort($elements, [$this->comparator, 'compare']);
+
+        return $elements;
+    }
+}