Let's talk about thinkphp output errors

ThinkPHP is a very popular PHP framework, but output errors are often encountered during the application process. This article will provide a detailed description of ThinkPHP output errors so that the majority of website developers can read and refer to them.

1. Error levels

ThinkPHP errors include three levels: Notice, Warning, and Fatal Error.

1. Notice, which is the prompt level, is usually caused by typos in the code or undefined variables. Although this type does not cause the program to crash, it still needs to be fixed.
2. Warning, which is the warning level, is usually caused by runtime code logic errors or configuration file problems. This type of error not only prompts, but also affects the normal function of the program.
3. Fatal Error, which is a fatal error level, causes the program to crash. It is usually caused by PHP syntax errors, memory exhaustion, or calling undefined functions.

2. Debugging method

1. Enable debugging mode

In the ThinkPHP framework, if the application is in development mode, you can configure it in the application Enable debugging in the file to display more error messages. Set in the "config.php" file:

'debug' => true,

2. View error log

ThinkPHP has a complete logging system, and all error messages will be recorded. You can obtain more error information by viewing the log file. The path of the log file can be configured in the application configuration file.

'log' => [
    'type'  => 'File', // 日志记录方式，内置basic和file
    'level' => ['error'], // 日志记录级别
    'path'  => LOG_PATH, // 日志保存目录
],

3. Error and Exception

In ThinkPHP, system errors and exceptions are output through Error and Exception, which are triggered in different situations. Error is usually caused by the system encountering serious problems during operation and the program cannot continue, while Exception is caused by incorrect logic in the program.

1. Error

In the ThinkPHP framework, when a system error occurs, the Error class will be triggered, thereby converting the error information into readable output content to facilitate programmers Perform debugging. The Error class renders and outputs error information to the console by automatically registering a callback function. Users can customize the callback function by configuring it in the application configuration file.

'error_handle'       => '',

2. Exception

When an exception occurs in the application, the Exception class will be triggered. The Exception class inherits the parent class PHP Exception. Usually, as a framework developer, you need to use try-catch structure to catch and handle exceptions. In the Catch block, you can customize the error message output.

try {
    // Some code...
} catch (\Exception $e) {
    echo $e->getMessage();
}

4. Summary

Note that in any application, try not to ignore any error messages. Even small mistakes can help you find problems and fix them more easily later in the development process. In the ThinkPHP framework, error information is an important part of exception information. Developers can learn more details about error information through debugging mode, error logs and custom callback functions to create an efficient, complete and A system without detailed errors.

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