When using ThinkPHP5 for development, due to various reasons, we may encounter various errors, especially when outputting the page, some unexpected errors may occur. If there is no detailed error message, it becomes difficult to find where the error lies. Therefore, during the development process, we need to know how to output detailed error information.

1. Set debugging mode

ThinkPHP5 provides a debugging mode that can help us output error information to the page in detail. In the development environment, we can turn on debugging mode to facilitate our development. However, in a production environment, we need to turn off debug mode to avoid leaking sensitive information.

The method to turn on the debug mode is as follows:

1. Open the app.php file in the config directory, find the debug option and set it to true.
2. Open the index.php file in the public directory, find the APP_DEBUG option, and set it to true.

Of course, in a production environment, we need to change these options to false to avoid leaking sensitive information.

2. Use exception handling

In addition to setting the debugging mode, we can also use exception handling to output detailed error information.

1. Exception

In ThinkPHP5, exception is a very important concept. Any error message is output through exception. Therefore, we need to learn how to use exceptions to output detailed error information.

In ThinkPHP5, exceptions are divided into three types:

1) \think\Exception: ordinary exception class, generally used for business logic restrictions, inheriting the Exception class that comes with PHP.

2) \think\exception\HttpException: HTTP exception class, used for exceptions related to HTTP requests.

3) \think\exception\ValidateException: Verification exception class, used to throw when the validator fails to verify.

2. Throw exception

In the program, if an error occurs, we can throw an exception to stop the program and output an error message. The following is a simple code example:

if(!$result)?{
????throw?new?\Exception('錯誤信息');
}

This code will throw an exception and output an error message when $result is false.

3. Catch exceptions

In the code, we can catch exceptions through the try...catch statement block and output error information. The following is a simple code example:

try?{
????//?可能會拋出異常的代碼
}?catch?(\Exception?$e)?{
????echo?$e->getMessage();
}

This code will execute the code in the try statement block. If an exception occurs during the execution, it will be captured by the catch statement block and an error message will be output.

3. Use logs to record error information

In addition to the above two methods, we can also use logs to record error information. We will not introduce too much about the logging system of ThinkPHP5 here. Here we will simply explain how to use logging to record error information.

1. Configuring the log

In the app.php file in the config directory, we can find the log configuration items and set the log driver and log storage path and other related configurations.

2. Logging

In the code, we can use the Log class to record logs. The following is a simple code example:

use?think\facade\Log;

try?{
????//?可能會拋出異常的代碼
}?catch?(\Exception?$e)?{
????Log::error('錯誤信息：'.$e->getMessage());
}

This code will execute the code in the try statement block. If an exception occurs during execution, it will be captured by the catch statement block and use the Log class to record error information.

Summary

The above are several methods for ThinkPHP5 to output error information. We can choose different methods to output detailed error information according to the specific situation, which makes it easier for us to develop and debug. During the development process, especially when outputting pages, we need to pay attention to security and readability, and try not to output too much sensitive information to avoid malicious attacks.

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