Added ErrorAction.

framework/yii/web/ErrorAction.php

+<?php
+/**
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\web;
+
+use Yii;
+use yii\base\Action;
+use yii\base\Exception;
+use yii\base\UserException;
+
+/**
+ * ErrorAction displays application errors using a specified view.
+ *
+ * To use ErrorAction, you need to do the following steps:
+ *
+ * First, declare an action of ErrorAction type in the `actions()` method of your `SiteController`
+ * class (or whatever controller you prefer), like the following:
+ *
+ * ```php
+ * public function actions()
+ * {
+ *     return array(
+ *         'error' => array(
+ *             'class' => 'yii\web\ErrorAction',
+ *         ),
+ *     );
+ * }
+ * ```
+ *
+ * Then, create a view file for this action. If the route of your error action is `site/error`, then
+ * the view file should be `views/site/error.php`. In this view file, the following variables are available:
+ *
+ * - `$name`: the error name
+ * - `$message`: the error message
+ * - `$exception`: the exception being handled
+ *
+ * Finally, configure the "errorHandler" application component as follows,
+ *
+ * ```php
+ * 'errorHandler' => array(
+ *     'errorAction' => 'site/error',
+ * )
+ * ```
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @since 2.0
+ */
+class ErrorAction extends Action
+{
+	/**
+	 * @var string the view file to be rendered. If not set, it will take the value of [[id]].
+	 * That means, if you name the action as "error" in "SiteController", then the view name
+	 * would be "error", and the corresponding view file would be "views/site/error.php".
+	 */
+	public $view;
+	/**
+	 * @var string the name of the error when the exception name cannot be determined.
+	 * Defaults to "Error".
+	 */
+	public $defaultName;
+	/**
+	 * @var string the message to be displayed when the exception message contains sensitive information.
+	 * Defaults to "An internal server error occurred.".
+	 */
+	public $defaultMessage;
+
+
+	public function run()
+	{
+		if (!($exception = Yii::$app->getErrorHandler()->exception)) {
+			return '';
+		}
+
+		if ($exception instanceof HttpException) {
+			$code = $exception->statusCode;
+		} else {
+			$code = $exception->getCode();
+		}
+		if ($exception instanceof Exception) {
+			$name = $exception->getName();
+		} else {
+			$name = $this->defaultName ?: Yii::t('yii', 'Error');
+		}
+		if ($code) {
+			$name .= " (#$code)";
+		}
+
+		if ($exception instanceof UserException) {
+			$message = $exception->getMessage();
+		} else {
+			$message = $this->defaultMessage ?: Yii::t('yii', 'An internal server error occurred.');
+		}
+
+		if (Yii::$app->getRequest()->getIsAjax()) {
+			return "$name: $message";
+		} else {
+			return $this->controller->render($this->view ?: $this->id, array(
+				'name' => $name,
+				'message' => $message,
+				'exception' => $exception,
+			));
+		}
+	}
+}