Added PasswordHelper.

framework/base/InvalidParamException.php

@@ -0,0 +1,28 @@
+<?php
+/**
+ * InvalidParamException class file.
+ *
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright &copy; 2008 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\base;
+
+/**
+ * InvalidParamException represents an exception caused by invalid parameters passed to a method.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @since 2.0
+ */
+class InvalidParamException extends Exception
+{
+	/**
+	 * @return string the user-friendly name of this exception
+	 */
+	public function getName()
+	{
+		return \Yii::t('yii|Invalid Parameter');
+	}
+}
+