php unified error code

PHP is a commonly used server-side scripting language and is widely used in Web development. During the development of PHP applications, we should pay attention to handling possible errors and exceptions, which is crucial to ensuring the stability and security of the application. In order to unify error codes, PHP has introduced some predefined error codes. This article will introduce these error codes.

PHP error codes are divided into two types: system error codes and user-defined error codes. System error codes are generally generated by the PHP engine or system functions, while user-defined error codes are errors that are manually created and thrown in the application. In PHP, each type of error has a corresponding error code, as follows:

1. System error code

System error code is generated by the PHP engine or system function , common system error codes include:

• E_ERROR: A serious error that causes PHP to be unable to continue execution and the program must be ended immediately.
• E_WARNING: Non-fatal warning indicating that a potential error exists, but PHP can continue execution.
• E_PARSE: Syntax parsing error, PHP cannot parse the code normally.
• E_NOTICE: Non-fatal reminder indicating possible problems, but PHP can continue execution.
• E_CORE_ERROR: The core error of the PHP engine cannot be recovered and the program must be stopped.
• E_CORE_WARNING: PHP engine core warning indicating the existence of potential core problems.
• E_COMPILE_ERROR: Compilation error, indicating errors that occur when compiling PHP code.
• E_COMPILE_WARNING: Compilation warning indicating potential compilation problems.
• E_USER_ERROR: A serious error manually thrown by the user.
• E_USER_WARNING: Non-fatal warning thrown manually by the user.
• E_USER_NOTICE: Non-fatal reminder manually thrown by the user.
• E_STRICT: Error caused by enabling strict mode.

2. User-defined error codes

User-defined error codes refer to errors that are manually created and thrown in the application. They are specifically defined as follows:

throw new Exception("错误消息", 错误代码);

Among them, "error message" refers to the description information of the error, and "error code" refers to the customized error code, which can be any non-negative integer.

The importance of unified error codes

When developing applications, unified error codes are very important for the following reasons:

1. Easier to maintain

Unified error codes make it easier for developers to locate and resolve errors. When an error occurs, developers only need to look for the corresponding error code to quickly find the problem and fix it.

2. Improve development efficiency

Using unified error codes allows developers to develop applications more efficiently. Since the error codes have been defined, developers can directly use the predefined error codes without having to repeatedly define and name error codes, saving development time and effort.

3. Improve application stability and security

By unifying error codes, developers can better handle errors and exceptions, minimizing application Ensure the stability and security of the application in case of crashes, security vulnerabilities and other issues.

Conclusion

In PHP development, unified error codes are very important for developers. It can improve development efficiency, improve application stability and security, and make the development process more efficient and easier to maintain. Therefore, in application development, we should use predefined error codes as much as possible to unify the definition of error codes to reduce the probability of application errors and improve the quality and reliability of applications.

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