it was created the Creational namespace and append its patterns

Creational/Pool/Pool.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace DesignPatterns\Creational\Pool;
+
+class Pool
+{
+
+    private $instances = array();
+    private $class;
+    
+    public function __construct($class)
+    {
+        $this->class = $class;
+    }
+
+    public function get()
+    {
+        if (count($this->instances) > 0) {
+            return array_pop($this->instances);
+        }
+
+        return new $this->class();
+    }
+
+    public function dispose($instance)
+    {
+        $this->instances[] = $instance;
+    }
+
+}