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diff --git a/Homeworks/1-Creational-design-patterns/Answer.php b/Homeworks/1-Creational-design-patterns/Answer.php
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+<?php
+//Creational design patterns
+
+abstract class DatabaseAbstractFactory
+{
+    public $connection;
+    abstract public function connection();
+    abstract public function query();
+}
+
+class MysqlFactory extends DatabaseAbstractFactory
+{
+    public function connection() {}
+
+    public function query() {}
+}
+
+class MSsqlFactory extends DatabaseAbstractFactory
+{
+    public function connection() {}
+
+    public function query() {}
+}
+
+class MariaDBFactory extends DatabaseAbstractFactory
+{
+    public function connection() {}
+
+    public function query() {}
+}
diff --git a/Homeworks/2-Structural-design-patterns/2-XML-Json-Adapter-UML.png b/Homeworks/2-Structural-design-patterns/2-XML-Json-Adapter-UML.png
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diff --git a/Homeworks/2-Structural-design-patterns/Answer.php b/Homeworks/2-Structural-design-patterns/Answer.php
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+<?php
+// Structural design patterns
+
+interface XMLInterface
+{
+    public function getXML();
+}
+
+class XML implements XMLInterface
+{
+    protected $xml;
+
+    public function getXML()
+    {
+        // return XML Format
+    }
+}
+
+
+interface JsonInterface
+{
+    public function getJson();
+}
+
+class Json implements JsonInterface
+{
+    protected $json;
+
+    public function getJson()
+    {
+        // return Json Format
+    }
+}
+
+
+class XMLAdapter implements JsonInterface
+{
+    protected $xml;
+
+    public function __construct(XMLInterface $xml)
+    {
+        $this->xml = $xml;
+    }
+
+    public function getJson()
+    {
+        $xml = simplexml_load_string($this->xml->getXML());
+        return json_encode($xml);
+    }
+}
diff --git a/Homeworks/3-Behavioral-design-patterns/3-Book-Iterator-UML.png b/Homeworks/3-Behavioral-design-patterns/3-Book-Iterator-UML.png
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diff --git a/Homeworks/3-Behavioral-design-patterns/Answer.php b/Homeworks/3-Behavioral-design-patterns/Answer.php
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+<?php
+// Behavioral design patterns
+
+class Book {
+    private $id, $content;
+    public function __construct($id, $content)
+    {
+        $this->id = $id;
+        $this->content  = $content;
+    }
+    public function getId()
+    {
+        return $this->id;
+    }
+    public function getContent()
+    {
+        return $this->content;
+    }
+}
+
+class BookList {
+    private $books = [];
+    private $bookCount = 0;
+
+    public function getBookCount()
+    {
+        return $this->bookCount;
+    }
+    public function getBook($bookNumber) {
+        return isset($this->books[$bookNumber]) ? $this->books[$bookNumber] : null;
+    }
+    public function addBook(Book $book)
+    {
+        $this->bookCount += 1;
+        $this->books[$this->bookCount] = $book;
+        return $this->bookCount;
+    }
+    public function removeBook(Book $book) {
+        $counter = 0;
+        while (++$counter <= $this->getBookCount()) {
+            if ($book->getId() == $this->books[$counter]->getId()) {
+                for ($i = $counter; $i < $this->getBookCount(); $i++) {
+                    $this->books[$i] = $this->books[$i + 1];
+                }
+                $this->bookCount -= 1;
+            }
+        }
+        return $this->getBookCount();
+    }
+}
+
+class BookListIterator {
+    protected $bookList;
+    protected $currentBook = 0;
+
+    public function __construct(BookList $bookList)
+    {
+        $this->bookList = $bookList;
+    }
+    public function getCurrentBook()
+    {
+        return isset($this->bookList[$this->currentBook]) ? $this->bookList[$this->currentBook] : null;
+    }
+    public function hasNextBook()
+    {
+        return $this->bookList->getBookCount() > $this->currentBook;
+    }
+    public function getNextBook() {
+        return $this->hasNextBook() ? $this->bookList->getBook(++$this->currentBook) : null;
+    }
+}
+
+class BookListReverseIterator extends BookListIterator {
+    public function __construct(BookList $bookList)
+    {
+        $this->bookList = $bookList;
+        $this->currentBook = $this->bookList->getBookCount() + 1;
+    }
+    public function hasNextBook() {
+        return 1 < $this->currentBook;
+    }
+    public function getNextBook() {
+        return $this->hasNextBook() ? $this->bookList->getBook(--$this->currentBook) : null;
+    }
+}