diff --git a/framework/yii/helpers/base/ArrayHelper.php b/framework/yii/helpers/base/ArrayHelper.php
index 07c7155..de64f61 100644
--- a/framework/yii/helpers/base/ArrayHelper.php
+++ b/framework/yii/helpers/base/ArrayHelper.php
@@ -21,13 +21,56 @@ use yii\base\InvalidParamException;
 class ArrayHelper
 {
 	/**
-	 * Converts the object into an array.
+	 * Converts an object or an array of objects into an array.
 	 * @param object|array $object the object to be converted into an array
+	 * @param array $properties a mapping from object class names to the properties that need to put into the resulting arrays.
+	 * The properties specified for each class is an array of the following format:
+	 *
+	 * ~~~
+	 * array(
+	 *     'app\models\Post' => array(
+	 *         'id',
+	 *         'title',
+	 *         // the key name in array result => property name
+	 *         'createTime' => 'create_time',
+	 *         // the key name in array result => anonymous function
+	 *         'length' => function ($post) {
+	 *             return strlen($post->content);
+	 *         },
+	 *     ),
+	 * )
+	 * ~~~
+	 *
+	 * The result of `ArrayHelper::toArray($post, $properties)` could be like the following:
+	 *
+	 * ~~~
+	 * array(
+	 *     'id' => 123,
+	 *     'title' => 'test',
+	 *     'createTime' => '2013-01-01 12:00AM',
+	 *     'length' => 301,
+	 * )
+	 * ~~~
+	 *
 	 * @param boolean $recursive whether to recursively converts properties which are objects into arrays.
 	 * @return array the array representation of the object
 	 */
-	public static function toArray($object, $recursive = true)
+	public static function toArray($object, $properties = array(), $recursive = true)
 	{
+		if (!empty($properties) && is_object($object)) {
+			$className = get_class($object);
+			if (!empty($properties[$className])) {
+				$result = array();
+				foreach ($properties[$className] as $key => $name) {
+					if (is_int($key)) {
+						$result[$name] = $object->$name;
+					} else {
+						$result[$key] = static::getValue($object, $name);
+					}
+				}
+				return $result;
+			}
+		}
 		if ($object instanceof Arrayable) {
 			$object = $object->toArray();
 			if (!$recursive) {
diff --git a/tests/unit/framework/helpers/ArrayHelperTest.php b/tests/unit/framework/helpers/ArrayHelperTest.php
index cfda9ae..3ec80fd 100644
--- a/tests/unit/framework/helpers/ArrayHelperTest.php
+++ b/tests/unit/framework/helpers/ArrayHelperTest.php
@@ -2,16 +2,61 @@
 
 namespace yiiunit\framework\helpers;
 
+use yii\base\Object;
 use yii\helpers\ArrayHelper;
 use yii\test\TestCase;
 use yii\data\Sort;
 
-class ArrayHelperTest extends TestCase
+class Post1
 {
-	public function testMerge()
-	{
+	public $id = 23;
+	public $title = 'tt';
+}
 
+class Post2 extends Object
+{
+	public $id = 123;
+	public $content = 'test';
+	private $secret = 's';
+	public function getSecret()
+	{
+		return $this->secret;
+	}
+}
 
+class ArrayHelperTest extends TestCase
+{
+	public function testToArray()
+	{
+		$object = new Post1;
+		$this->assertEquals(get_object_vars($object), ArrayHelper::toArray($object));
+		$object = new Post2;
+		$this->assertEquals(get_object_vars($object), ArrayHelper::toArray($object));
+
+		$object1 = new Post1;
+		$object2 = new Post2;
+		$this->assertEquals(array(
+			get_object_vars($object1),
+			get_object_vars($object2),
+		), ArrayHelper::toArray(array(
+			$object1,
+			$object2,
+		)));
+
+		$object = new Post2;
+		$this->assertEquals(array(
+			'id' => 123,
+			'secret' => 's',
+			'_content' => 'test',
+			'length' => 4,
+		), ArrayHelper::toArray($object, array(
+			$object->className() => array(
+				'id', 'secret',
+				'_content' => 'content',
+				'length' => function ($post) {
+					return strlen($post->content);
+				}
+		))));
 	}
 
 	public function testRemove()