First prototype
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+<?php
+
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc. All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+// * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+/**
+ * RepeatedField and RepeatedFieldIter are used by generated protocol message
+ * classes to manipulate repeated fields.
+ */
+
+namespace Google\Protobuf\Internal;
+
+/**
+ * RepeatedFieldIter is used to iterate RepeatedField. It is also need for the
+ * foreach syntax.
+ */
+class RepeatedFieldIter implements \Iterator
+{
+
+ /**
+ * @ignore
+ */
+ private $position;
+ /**
+ * @ignore
+ */
+ private $container;
+
+ /**
+ * Create iterator instance for RepeatedField.
+ *
+ * @param RepeatedField The RepeatedField instance for which this iterator
+ * is created.
+ * @ignore
+ */
+ public function __construct($container)
+ {
+ $this->position = 0;
+ $this->container = $container;
+ }
+
+ /**
+ * Reset the status of the iterator
+ *
+ * @return void
+ */
+ public function rewind()
+ {
+ $this->position = 0;
+ }
+
+ /**
+ * Return the element at the current position.
+ *
+ * @return object The element at the current position.
+ */
+ public function current()
+ {
+ return $this->container[$this->position];
+ }
+
+ /**
+ * Return the current position.
+ *
+ * @return integer The current position.
+ */
+ public function key()
+ {
+ return $this->position;
+ }
+
+ /**
+ * Move to the next position.
+ *
+ * @return void
+ */
+ public function next()
+ {
+ ++$this->position;
+ }
+
+ /**
+ * Check whether there are more elements to iterate.
+ *
+ * @return bool True if there are more elements to iterate.
+ */
+ public function valid()
+ {
+ return isset($this->container[$this->position]);
+ }
+}