Added feature to allow array usage of html node.

fixes paquettg#26

Author: paquettg

src/PHPHtmlParser/Dom/AbstractNode.php

@@ -210,6 +210,41 @@ public function getChild($id)
 		return $this->children[$id]['node'];
 	}
 
+	/**
+	 * Returns a new array of child nodes
+	 *
+	 * @return array
+	 */
+	public function getChildren() 
+	{
+		$nodes = [];
+		try
+		{
+			$child = $this->firstChild();
+			do
+			{
+				$nodes[] = $child;
+				$child   = $this->nextChild($child->id());
+			} while ( ! is_null($child));
+		}
+		catch (ChildNotFoundException $e)
+		{
+			// we are done looking for children
+		}
+
+		return $nodes;
+	}
+
+	/**
+	 * Counts children
+	 *
+	 * @return int
+	 */
+	public function countChildren() 
+	{
+		return count($this->children);
+	}
+
 	/**
 	 * Adds a child node to this node and returns the id of the child for this
 	 * parent.

src/PHPHtmlParser/Dom/ArrayNode.php

@@ -0,0 +1,42 @@
+<?php
+namespace PHPHtmlParser\Dom;
+
+use Countable;
+use ArrayIterator;
+use IteratorAggregate;
+use PHPHtmlParser\Exceptions\IncorrectChildMethodException;
+
+/**
+ * Dom node object which will allow users to use it as
+ * an array.
+ */
+abstract class ArrayNode extends AbstractNode implements IteratorAggregate, Countable {
+
+	/**
+	 * Returns the array to be used the the iterator.
+	 *
+	 * @return array
+	 */
+	abstract protected function getIteratorArray();
+
+	/**
+	 * Gets the iterator 
+	 *
+	 * @return ArrayIterator
+	 */
+	public function getIterator()
+	{
+		return new ArrayIterator($this->getIteratorArray());
+	}
+
+	/**
+	 * Returns the count of the iterator array.
+	 *
+	 * @return int
+	 */
+	public function count()
+	{
+		return count($this->getIteratorArray());
+	}
+
+}

src/PHPHtmlParser/Dom/HtmlNode.php

@@ -4,7 +4,7 @@
 use PHPHtmlParser\Exceptions\UnknownChildTypeException;
 use PHPHtmlParser\Exceptions\ChildNotFoundException;
 
-class HtmlNode extends AbstractNode {
+class HtmlNode extends ArrayNode {
 
 	/**
 	 * Remembers what the innerHtml was if it was scaned previously.
@@ -202,4 +202,14 @@ protected function clear()
 		$this->outerHtml = null;
 		$this->text		 = null;
 	}
+
+	/**
+	 * Returns all children of this html node.
+	 * 
+	 * @return array
+	 */
+	protected function getIteratorArray()
+	{
+		return $this->getChildren();
+	}
 }