diff --git a/framework/util/VarDumper.php b/framework/util/VarDumper.php
new file mode 100644
index 0000000..7497a03
--- /dev/null
+++ b/framework/util/VarDumper.php
@@ -0,0 +1,144 @@
+<?php
+/**
+ * VarDumper class file.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright &copy; 2008-2011 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\util;
+
+/**
+ * VarDumper is intended to replace the buggy PHP function var_dump and print_r.
+ * It can correctly identify the recursively referenced objects in a complex
+ * object structure. It also has a recursive depth control to avoid indefinite
+ * recursive display of some peculiar variables.
+ *
+ * VarDumper can be used as follows,
+ * <pre>
+ * VarDumper::dump($var);
+ * </pre>
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @since 2.0
+ */
+class VarDumper
+{
+	private static $_objects;
+	private static $_output;
+	private static $_depth;
+
+	/**
+	 * Displays a variable.
+	 * This method achieves the similar functionality as var_dump and print_r
+	 * but is more robust when handling complex objects such as Yii controllers.
+	 * @param mixed $var variable to be dumped
+	 * @param integer $depth maximum depth that the dumper should go into the variable. Defaults to 10.
+	 * @param boolean $highlight whether the result should be syntax-highlighted
+	 */
+	public static function dump($var,$depth=10,$highlight=false)
+	{
+		echo self::dumpAsString($var,$depth,$highlight);
+	}
+
+	/**
+	 * Dumps a variable in terms of a string.
+	 * This method achieves the similar functionality as var_dump and print_r
+	 * but is more robust when handling complex objects such as Yii controllers.
+	 * @param mixed $var variable to be dumped
+	 * @param integer $depth maximum depth that the dumper should go into the variable. Defaults to 10.
+	 * @param boolean $highlight whether the result should be syntax-highlighted
+	 * @return string the string representation of the variable
+	 */
+	public static function dumpAsString($var,$depth=10,$highlight=false)
+	{
+		self::$_output='';
+		self::$_objects=array();
+		self::$_depth=$depth;
+		self::dumpInternal($var,0);
+		if($highlight)
+		{
+			$result=highlight_string("<?php\n".self::$_output,true);
+			self::$_output=preg_replace('/&lt;\\?php<br \\/>/','',$result,1);
+		}
+		return self::$_output;
+	}
+
+	/*
+	 * @param mixed $var variable to be dumped
+	 * @param integer $level depth level
+	 */
+	private static function dumpInternal($var,$level)
+	{
+		switch(gettype($var))
+		{
+			case 'boolean':
+				self::$_output.=$var?'true':'false';
+				break;
+			case 'integer':
+				self::$_output.="$var";
+				break;
+			case 'double':
+				self::$_output.="$var";
+				break;
+			case 'string':
+				self::$_output.="'".addslashes($var)."'";
+				break;
+			case 'resource':
+				self::$_output.='{resource}';
+				break;
+			case 'NULL':
+				self::$_output.="null";
+				break;
+			case 'unknown type':
+				self::$_output.='{unknown}';
+				break;
+			case 'array':
+				if(self::$_depth<=$level)
+					self::$_output.='array(...)';
+				else if(empty($var))
+					self::$_output.='array()';
+				else
+				{
+					$keys=array_keys($var);
+					$spaces=str_repeat(' ',$level*4);
+					self::$_output.="array\n".$spaces.'(';
+					foreach($keys as $key)
+					{
+						if(gettype($key)=='integer')
+							$key2=$key;
+						else
+							$key2="'".str_replace("'","\\'",$key)."'";
+
+						self::$_output.="\n".$spaces."    $key2 => ";
+						self::$_output.=self::dumpInternal($var[$key],$level+1);
+					}
+					self::$_output.="\n".$spaces.')';
+				}
+				break;
+			case 'object':
+				if(($id=array_search($var,self::$_objects,true))!==false)
+					self::$_output.=get_class($var).'#'.($id+1).'(...)';
+				else if(self::$_depth<=$level)
+					self::$_output.=get_class($var).'(...)';
+				else
+				{
+					$id=array_push(self::$_objects,$var);
+					$className=get_class($var);
+					$members=(array)$var;
+					$spaces=str_repeat(' ',$level*4);
+					self::$_output.="$className#$id\n".$spaces.'(';
+					foreach($members as $key=>$value)
+					{
+						$keyDisplay=strtr(trim($key),array("\0"=>':'));
+						self::$_output.="\n".$spaces."    [$keyDisplay] => ";
+						self::$_output.=self::dumpInternal($value,$level+1);
+					}
+					self::$_output.="\n".$spaces.')';
+				}
+				break;
+		}
+	}
+}
\ No newline at end of file