Comprehensive analysis and troubleshooting methods of PHP error level types

Title: Comprehensive analysis of PHP error level types and troubleshooting methods

In the PHP development process, we often encounter various errors. It is very important to understand the types of PHP error levels and the corresponding troubleshooting methods. This article will provide a comprehensive analysis of PHP error level types and provide specific code examples to help you better understand and handle these errors.

1. Types of PHP error levels

PHP error levels are divided into the following types:

1. E_ERROR (1) : Fatal error, Causes the script to terminate execution.
2. E_WARNING (2) : Warning error, operation is not affected, but may cause unexpected behavior.
3. E_NOTICE (8) : Prompt error, does not affect script execution, but may cause code problems.
4. E_PARSE (4) : Compile time error, usually caused by syntax errors.
5. E_STRICT (2048) : PHP’s strict standardization of code.
6. E_DEPRECATED (8192) : Feature or function marked as obsolete.
7. E_USER_ERROR (256) : Fatal error triggered by user-defined function.
8. E_USER_WARNING (512) : Warning error triggered by user-defined function.
9. E_USER_NOTICE (1024) : Prompt error triggered by user-defined function.

2. Examples of troubleshooting methods

1. Error logging

// 开启错误日志记录
ini_set('error_log', 'error.log');
// 记录所有错误
ini_set('log_errors', 'On');
// 设置错误日志级别
ini_set('error_reporting', E_ALL);

2. Debugging errors

// 开启调试模式
ini_set('display_errors', 'On');
// 显示所有错误
error_reporting(E_ALL);

3. Specific error handling

// 自定义错误处理函数
function custom_error_handler($errno, $errstr, $errfile, $errline) {
    echo "错误类型：{$errno}，错误信息：{$errstr}，错误文件：{$errfile}，错误行数：{$errline}";
}

// 设置自定义错误处理函数
set_error_handler("custom_error_handler");

Conclusion

Through the introduction of this article, you should have a clearer understanding of the types of PHP error levels, and also understand the methods of handling and troubleshooting various errors. During the development process, it is very important to detect and solve errors in time. I hope this article can help you better deal with various errors in PHP. Good luck with your programming!

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