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diff --git a/vendor/symfony/finder/Iterator/SortableIterator.php b/vendor/symfony/finder/Iterator/SortableIterator.php
new file mode 100644
index 000000000..f1134c00b
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+++ b/vendor/symfony/finder/Iterator/SortableIterator.php
@@ -0,0 +1,82 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Finder\Iterator;
+
+/**
+ * SortableIterator applies a sort on a given Iterator.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class SortableIterator implements \IteratorAggregate
+{
+    const SORT_BY_NAME = 1;
+    const SORT_BY_TYPE = 2;
+    const SORT_BY_ACCESSED_TIME = 3;
+    const SORT_BY_CHANGED_TIME = 4;
+    const SORT_BY_MODIFIED_TIME = 5;
+
+    private $iterator;
+    private $sort;
+
+    /**
+     * Constructor.
+     *
+     * @param \Traversable $iterator The Iterator to filter
+     * @param int|callable $sort     The sort type (SORT_BY_NAME, SORT_BY_TYPE, or a PHP callback)
+     *
+     * @throws \InvalidArgumentException
+     */
+    public function __construct(\Traversable $iterator, $sort)
+    {
+        $this->iterator = $iterator;
+
+        if (self::SORT_BY_NAME === $sort) {
+            $this->sort = function ($a, $b) {
+                return strcmp($a->getRealpath() ?: $a->getPathname(), $b->getRealpath() ?: $b->getPathname());
+            };
+        } elseif (self::SORT_BY_TYPE === $sort) {
+            $this->sort = function ($a, $b) {
+                if ($a->isDir() && $b->isFile()) {
+                    return -1;
+                } elseif ($a->isFile() && $b->isDir()) {
+                    return 1;
+                }
+
+                return strcmp($a->getRealpath() ?: $a->getPathname(), $b->getRealpath() ?: $b->getPathname());
+            };
+        } elseif (self::SORT_BY_ACCESSED_TIME === $sort) {
+            $this->sort = function ($a, $b) {
+                return $a->getATime() - $b->getATime();
+            };
+        } elseif (self::SORT_BY_CHANGED_TIME === $sort) {
+            $this->sort = function ($a, $b) {
+                return $a->getCTime() - $b->getCTime();
+            };
+        } elseif (self::SORT_BY_MODIFIED_TIME === $sort) {
+            $this->sort = function ($a, $b) {
+                return $a->getMTime() - $b->getMTime();
+            };
+        } elseif (is_callable($sort)) {
+            $this->sort = $sort;
+        } else {
+            throw new \InvalidArgumentException('The SortableIterator takes a PHP callable or a valid built-in sort algorithm as an argument.');
+        }
+    }
+
+    public function getIterator()
+    {
+        $array = iterator_to_array($this->iterator, true);
+        uasort($array, $this->sort);
+
+        return new \ArrayIterator($array);
+    }
+}