Initial PrefixPathLoader tests

- Modified most functionality to use SPL (or SPL-derivative) classes
- Removed all statics (preparing for another solution)

src/ArrayStack.php

@@ -0,0 +1,52 @@
+<?php
+/**
+ * Zend Framework
+ *
+ * LICENSE
+ *
+ * This source file is subject to the new BSD license that is bundled
+ * with this package in the file LICENSE.txt.
+ * It is also available through the world-wide-web at this URL:
+ * http://framework.zend.com/license/new-bsd
+ * If you did not receive a copy of the license and are unable to
+ * obtain it through the world-wide-web, please send an email
+ * to license@zend.com so we can send you a copy immediately.
+ *
+ * @category   Zend
+ * @package    Zend_Stdlib
+ * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license    http://framework.zend.com/license/new-bsd     New BSD License
+ */
+
+/**
+ * @namespace
+ */
+namespace Zend\Stdlib;
+
+use ArrayIterator,
+    ArrayObject;
+
+/**
+ * ArrayObject that acts as a stack with regards to iteration
+ *
+ * @category   Zend
+ * @package    Zend_Stdlib
+ * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license    http://framework.zend.com/license/new-bsd     New BSD License
+ */
+class ArrayStack extends ArrayObject
+{
+    /**
+     * Retrieve iterator
+     *
+     * Retrieve an array copy of the object, reverse its order, and return an 
+     * ArrayIterator with that reversed array.
+     * 
+     * @return ArrayIterator
+     */
+    public function getIterator()
+    {
+        $array = $this->getArrayCopy();
+        return new ArrayIterator(array_reverse($array));
+    }
+}