new file mode 100644

@@ -0,0 +1,44 @@

+<?php

+

+namespace Telnyx\Util;

+

+use IteratorAggregate;

+use ArrayIterator;

+

+class Set implements IteratorAggregate

+{

+    private $_elts;

+

+    public function __construct($members = [])

+    {

+        $this->_elts = [];

+        foreach ($members as $item) {

+            $this->_elts[$item] = true;

+        }

+    }

+

+    public function includes($elt)

+    {

+        return isset($this->_elts[$elt]);

+    }

+

+    public function add($elt)

+    {

+        $this->_elts[$elt] = true;

+    }

+

+    public function discard($elt)

+    {

+        unset($this->_elts[$elt]);

+    }

+

+    public function toArray()

+    {

+        return array_keys($this->_elts);

+    }

+

+    public function getIterator()

+    {

+        return new ArrayIterator($this->toArray());

+    }

+}