PHP Try-catch 语句使用技巧，try-catch使用技巧
PHP Try-catch 语句使用技巧，try-catch使用技巧
PHP Try-catch 语句
为了进一步处理异常，我们需要使用try-catch语句----包括Try语句和至少一个的catch语句。任何调用 可能抛出异常的方法的代码都应该使用try语句。Catch语句用来处理可能抛出的异常。以下显示了我们处理getCommandObject()抛出的异常的方法：
<?php
try {
$mgr = new CommandManager();
$cmd = $mgr->getCommandObject("realcommand");
$cmd->execute();
} catch (Exception $e) {
print $e->getMessage();
exit();
}
?>可以看到，通过结合使用throw关键字和try-catch语句，我们可以避免错误标记“污染”类方法返回的值。因为“异常”本身就是一种与其它任何对象不同的PHP内建的类型，不会产生混淆。
如果抛出了一个异常，try语句中的脚本将会停止执行，然后马上转向执行catch语句中的脚本。
如果异常抛出了却没有被捕捉到，就会产生一个fatal error。
您可能感兴趣的文章:
- php Try Catch异常测试
- php中try catch捕获异常实例详解
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
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
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
1677
14
1431
52
1334
25
1280
29
1257
24
The Continued Use of PHP: Reasons for Its Endurance
Apr 19, 2025 am 12:23 AM
What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.
What happens if session_start() is called multiple times?
Apr 25, 2025 am 12:06 AM
Multiple calls to session_start() will result in warning messages and possible data overwrites. 1) PHP will issue a warning, prompting that the session has been started. 2) It may cause unexpected overwriting of session data. 3) Use session_status() to check the session status to avoid repeated calls.
The Compatibility of IIS and PHP: A Deep Dive
Apr 22, 2025 am 12:01 AM
IIS and PHP are compatible and are implemented through FastCGI. 1.IIS forwards the .php file request to the FastCGI module through the configuration file. 2. The FastCGI module starts the PHP process to process requests to improve performance and stability. 3. In actual applications, you need to pay attention to configuration details, error debugging and performance optimization.
What is the significance of the session_start() function?
May 03, 2025 am 12:18 AM
session_start()iscrucialinPHPformanagingusersessions.1)Itinitiatesanewsessionifnoneexists,2)resumesanexistingsession,and3)setsasessioncookieforcontinuityacrossrequests,enablingapplicationslikeuserauthenticationandpersonalizedcontent.
Composer: Aiding PHP Development Through AI
Apr 29, 2025 am 12:27 AM
AI can help optimize the use of Composer. Specific methods include: 1. Dependency management optimization: AI analyzes dependencies, recommends the best version combination, and reduces conflicts. 2. Automated code generation: AI generates composer.json files that conform to best practices. 3. Improve code quality: AI detects potential problems, provides optimization suggestions, and improves code quality. These methods are implemented through machine learning and natural language processing technologies to help developers improve efficiency and code quality.
Using Laravel: Streamlining Web Development with PHP
Apr 19, 2025 am 12:18 AM
Laravel optimizes the web development process including: 1. Use the routing system to manage the URL structure; 2. Use the Blade template engine to simplify view development; 3. Handle time-consuming tasks through queues; 4. Use EloquentORM to simplify database operations; 5. Follow best practices to improve code quality and maintainability.
PHP and IIS: Making Them Work Together
Apr 21, 2025 am 12:06 AM
Configuring and running PHP on IIS requires the following steps: 1) Download and install PHP, 2) Configuring IIS and adding FastCGI module, 3) Create and set up an application pool, 4) Create a website and bind to an application pool. Through these steps, you can easily deploy PHP applications on your Windows server and improve application stability and efficiency by configuring scaling and optimizing performance.
H5: Key Improvements in HTML5
Apr 28, 2025 am 12:26 AM
HTML5 brings five key improvements: 1. Semantic tags improve code clarity and SEO effects; 2. Multimedia support simplifies video and audio embedding; 3. Form enhancement simplifies verification; 4. Offline and local storage improves user experience; 5. Canvas and graphics functions enhance the visualization of web pages.
