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diff --git a/‎Behavioral/Iterator/Book.php
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diff --git a/‎Behavioral/Iterator/BookList.php
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diff --git a/‎Behavioral/Iterator/BookListIterator.php
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diff --git a/‎Behavioral/Iterator/BookListReverseIterator.php
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diff --git a/‎Behavioral/Iterator/File.php
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diff --git a/‎Behavioral/Iterator/Row.php
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diff --git a/‎Behavioral/Iterator/RowSet.php
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@@ -0,0 +1,32 @@
+<?php
+
+namespace DesignPatterns\Behavioral\Iterator;
+
+class Book
+{
+
+    private $author;
+
+    private $title;
+
+    public function __construct($title, $author)
+    {
+        $this->author = $author;
+        $this->title = $title;
+    }
+
+    public function getAuthor()
+    {
+        return $this->author;
+    }
+
+    public function getTitle()
+    {
+        return $this->title;
+    }
+
+    public function getAuthorAndTitle()
+    {
+        return $this->getTitle() . ' by ' . $this->getAuthor();
+    }
+}
@@ -0,0 +1,42 @@
+<?php
+
+namespace DesignPatterns\Behavioral\Iterator;
+
+class BookList implements \Countable
+{
+
+    private $books;
+
+    public function getBook($bookNumberToGet)
+    {
+        if ((int)$bookNumberToGet <= $this->count()) {
+            return $this->books[$bookNumberToGet];
+        }
+
+        return NULL;
+    }
+
+    public function addBook(Book $book)
+    {
+        $this->books[] = $book;
+
+        return $this->count();
+    }
+
+    public function removeBook(Book $bookToRemove)
+    {
+        foreach ($this as $key => $book) {
+            /** @var Book $book */
+            if ($book->getAuthorAndTitle() === $bookToRemove->getAuthorAndTitle()) {
+                unset($this->books[$key]);
+            }
+        }
+
+        return $this->count();
+    }
+
+    public function count()
+    {
+        return count($this->books);
+    }
+}
@@ -0,0 +1,77 @@
+<?php
+
+namespace DesignPatterns\Behavioral\Iterator;
+
+class BookListIterator implements \Iterator
+{
+
+    /**
+     * @var BookList
+     */
+    protected $bookList;
+
+    /**
+     * @var int
+     */
+    protected $currentBook = 0;
+
+    public function __construct(BookList $bookList)
+    {
+        $this->bookList = $bookList;
+    }
+
+    /**
+     * Return the current book
+     * @link http://php.net/manual/en/iterator.current.php
+     * @return Book Can return any type.
+     */
+    public function current()
+    {
+        return $this->bookList->getBook($this->currentBook);
+    }
+
+    /**
+     * (PHP 5 &gt;= 5.0.0)<br/>
+     * Move forward to next element
+     * @link http://php.net/manual/en/iterator.next.php
+     * @return void Any returned value is ignored.
+     */
+    public function next()
+    {
+        $this->currentBook++;
+    }
+
+    /**
+     * (PHP 5 &gt;= 5.0.0)<br/>
+     * Return the key of the current element
+     * @link http://php.net/manual/en/iterator.key.php
+     * @return mixed scalar on success, or null on failure.
+     */
+    public function key()
+    {
+        return $this->currentBook;
+    }
+
+    /**
+     * (PHP 5 &gt;= 5.0.0)<br/>
+     * Checks if current position is valid
+     * @link http://php.net/manual/en/iterator.valid.php
+     * @return boolean The return value will be casted to boolean and then evaluated.
+     *       Returns true on success or false on failure.
+     */
+    public function valid()
+    {
+        return $this->currentBook < $this->bookList->count();
+    }
+
+    /**
+     * (PHP 5 &gt;= 5.0.0)<br/>
+     * Rewind the Iterator to the first element
+     * @link http://php.net/manual/en/iterator.rewind.php
+     * @return void Any returned value is ignored.
+     */
+    public function rewind()
+    {
+        $this->currentBook = 0;
+    }
+}
@@ -0,0 +1,23 @@
+<?php
+
+namespace DesignPatterns\Behavioral\Iterator;
+
+class BookListReverseIterator extends BookListIterator
+{
+
+    public function __construct(BookList $bookList)
+    {
+        $this->bookList = $bookList;
+        $this->currentBook = $this->bookList->count() - 1;
+    }
+
+    public function next()
+    {
+        $this->currentBook--;
+    }
+
+    public function valid()
+    {
+        return 0 <= $this->currentBook;
+    }
+}