Error page and exception handling in Yii framework
Yii framework is a high-performance PHP framework widely used in web application development. In Yii applications, error pages and exception handling modules are one of the very important functions. This article will briefly introduce the error page and exception handling modules in the Yii framework, and provide some practical sample code to help you better understand and use these functions.
1. Error page
When the user accesses a page that does not exist, an incorrect connection occurs, or other errors occur, the Yii framework will display an error page by default. This page usually contains some error information, such as error code and error message. Although the Yii framework's default error page can meet basic needs, the original error page is usually not very beautiful, and it does not provide enough error information to locate and solve the problem.
The Yii framework allows developers to customize error pages to improve user experience and problem location. The method to customize the error page is very simple. First, configure the error handler in the configuration file of the Yii application:
'errorHandler' => [ 'errorAction' => 'site/error', ],
The errorAction
parameter here specifies the Yii framework when an error occurs. The default error handling controller and method to jump to. Now we need to create this error handling method in SiteController
:
public function actionError() { $exception = Yii::$app->errorHandler->exception; if ($exception !== null) { return $this->render('error', ['exception' => $exception]); } }
This method will load a custom error
page, which needs to be written by its own developer . In this page, you can display more detailed error information, including stack information, etc. The following is a simple example:
File: views/site/error.php
<?php use yiihelpersHtml; $this->title = 'Error'; ?> <div class="site-error"> <h1><?= Html::encode($this->title) ?></h1> <div class="alert alert-danger"> <?= nl2br(Html::encode($exception->getMessage())) ?> </div> <p> The above error occurred while the Web server was processing your request. </p> <p> Please contact us if you think this is a server error. Thank you. </p> </div>
2. Exception handling
In Yii applications, exception handlers are developed It is very useful when dealing with various irregular or unexpected situations. In business logic, various unknown situations may occur, such as invalid data input, database connection timeout, insufficient disk space, network connection errors, etc. Handling these exceptions requires great care and professional skills and experience.
In the Yii framework, using exception handlers is very simple. You can demonstrate this with the following code snippet:
try { // Some code that may throw an exception. } catch (Exception $e) { Yii::error($e->getMessage()); $response = Yii::$app->getResponse(); $response->setStatusCode(500); $response->content = 'We are sorry, but something went wrong.'; // 如果是Ajax请求,则返回JSON数据 if (Yii::$app->getRequest()->getIsAjax()) { $response->content = json_encode(['message' => $e->getMessage()]); } $response->send(); Yii::$app->end(); }
In this code snippet, the try
block contains some code that may throw an exception. If an exception occurs, the exception handler will catch the exception (catch
block) and perform some operations. Here, the Yii::error()
method will record exception information to Yii's log. Then, we set the response code to 500 and construct an error message to be returned to the user as page content. If an Ajax request is used, an error message in JSON format is output and returned to the caller.
3. Summary
In this article we introduced the error page and exception handling functions of the Yii framework. Error handling is important for user experience and troubleshooting. Customized error pages can provide more error information and a better user experience. Exception handlers can protect applications from threats posed by various unknown and illegal exceptions. In actual development, you can arrange and configure according to your own needs to develop more robust and reliable applications.
The above is the detailed content of Error page and exception handling in Yii framework. For more information, please follow other related articles on the PHP Chinese website!

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

Function exception handling in C++ is particularly important for multi-threaded environments to ensure thread safety and data integrity. The try-catch statement allows you to catch and handle specific types of exceptions when they occur to prevent program crashes or data corruption.

C++ exception handling allows the creation of custom error handling routines to handle runtime errors by throwing exceptions and catching them using try-catch blocks. 1. Create a custom exception class derived from the exception class and override the what() method; 2. Use the throw keyword to throw an exception; 3. Use the try-catch block to catch exceptions and specify the exception types that can be handled.

Exception handling in recursive calls: Limiting recursion depth: Preventing stack overflow. Use exception handling: Use try-catch statements to handle exceptions. Tail recursion optimization: avoid stack overflow.

In multithreaded C++, exception handling follows the following principles: timeliness, thread safety, and clarity. In practice, you can ensure thread safety of exception handling code by using mutex or atomic variables. Additionally, consider reentrancy, performance, and testing of your exception handling code to ensure it runs safely and efficiently in a multi-threaded environment.

Key points of exception handling in a multi-threaded environment: Catching exceptions: Each thread uses a try-catch block to catch exceptions. Handle exceptions: print error information or perform error handling logic in the catch block. Terminate the thread: When recovery is impossible, call Thread.stop() to terminate the thread. UncaughtExceptionHandler: To handle uncaught exceptions, you need to implement this interface and assign it to the thread. Practical case: exception handling in the thread pool, using UncaughtExceptionHandler to handle uncaught exceptions.

Exception handling in C++ Lambda expressions does not have its own scope, and exceptions are not caught by default. To catch exceptions, you can use Lambda expression catching syntax, which allows a Lambda expression to capture a variable within its definition scope, allowing exception handling in a try-catch block.

PHP exception handling: Understanding system behavior through exception tracking Exceptions are the mechanism used by PHP to handle errors, and exceptions are handled by exception handlers. The exception class Exception represents general exceptions, while the Throwable class represents all exceptions. Use the throw keyword to throw exceptions and use try...catch statements to define exception handlers. In practical cases, exception handling is used to capture and handle DivisionByZeroError that may be thrown by the calculate() function to ensure that the application can fail gracefully when an error occurs.

In multi-threaded C++, exception handling is implemented through the std::promise and std::future mechanisms: use the promise object to record the exception in the thread that throws the exception. Use a future object to check for exceptions in the thread that receives the exception. Practical cases show how to use promises and futures to catch and handle exceptions in different threads.
