How to use laravel log? Detailed usage explanation

Laravel is a popular PHP web application framework that provides a variety of functions and tools. On the one hand, it can help developers develop web applications more efficiently, and on the other hand, it can help monitor the running status of the application. Among them, logging is a very important technical means that can help developers better understand the running process and existing problems of Web applications. It is very important for the development and maintenance of Web applications. So, how to use Laravel logs?

Why we need to use Laravel logs

First of all, we need to know why we need to use logging. When an application is running, many errors and exceptions are difficult to predict, and these errors and exceptions can easily affect the user experience. If logs can be used to record these errors and exceptions, by analyzing the log files, we can find and fix problems in time, avoid users' bad experience, and improve the reliability and stability of the application.

In addition, logging can also help us understand the running status of web applications, such as the number of visits, user operation behavior, etc. By analyzing log files, we can better understand user needs and application bottlenecks, and carry out targeted optimization and upgrades.

How to use Laravel logs

Laravel provides a very convenient logging mechanism that can easily record application log information. Below, we'll cover how to use logging in Laravel.

Laravel Logger

In Laravel, we can use the logger (Logger) to record log information. Logger is a logging mechanism provided by the Laravel framework, which can easily send log messages to a variety of different destinations, such as file logs, database logs, etc. The Laravel logger uses "singleton mode" to achieve global use of logging and can be called anywhere.

Laravel log level

In Laravel logging, we can use a variety of different log levels, such as: debug, info, notice, warning, error, critical, alert, emergency. Different levels correspond to different log message types and severity. For example, log messages logged using the debug level are debugging information, and log messages logged using the emergency level are very serious exception information.

Laravel log storage

In Laravel, we can store log messages to different destinations, such as file logs, database logs, etc. Normally, we store log messages into file logs.

Laravel File Log

In Laravel, we can use loggers to store log messages into files. Using file logs, we can view log messages more conveniently and process them more flexibly.

Laravel uses the Monolog library to implement a series of logging functions. Monolog is a powerful logging library based on PHP. It provides a variety of log destinations (handlers) and multiple log formats (formatters), which can easily record and process log messages.

Log messages in Laravel are stored in the storage/logs/laravel.log file by default. We can record log messages by calling the logger method, for example:

use Illuminate\Support\Facades\Log;

Log::info('这是一条信息');
Log::warning('这是一条警告');
Log::error('这是一条错误');

Laravel logging Configuration

In Laravel, we can configure the parameters of the logger (Logger) in the configuration file, such as timestamp format, log level, log processor, etc. In the configuration file provided by Laravel, we can find the config/logging.php file. Through this file, we can fully configure the logger.

Commonly used configuration options include:

• channels: Define log channels, usually we use the default value;
• default: Define the default log suite. Normally, we will use the stack function to define a "stack" processor and set multiple log processing methods, such as file logs, streaming media logs, etc.;
• stack: Define a "stack" processor and set multiple log processing methods.

File log configuration

In Laravel, we can use the log processor log to specify file logs. By default, Laravel log messages are stored in the storage/logs/laravel.log file. Through the configuration file, we can change the default log file name and path, for example:

'channels' => [
    'daily' => [
        'driver' => 'daily',
        'path' => storage_path('logs/laravel.log'),
        'level' => 'debug',
        'days' => 14,
    ],
],

In this example, we use the 'daily' channel and store the log messages to 'storage_path('logs/laravel.log ')' file and stores 14 days of log records by default.

Stream log configuration

In Laravel, we can use the log processor stream to specify the stream target, so that we can send log messages to different streams during processing. Very convenient. For example:

'channels' => [
    'single' => [
        'driver' => 'single',
        'path' => storage_path('logs/laravel.log'),
        'level' => 'debug',
    ],
    'slack' => [
        'driver' => 'slack',
        'url' => env('LOG_SLACK_WEBHOOK_URL'),
        'username' => 'Laravel Log',
        'emoji' => ':boom:',
        'level' => 'critical',
    ],
],

In this example, we use the 'slack' channel and notify the administrator about the existence of a critical error through Slack. For example, Laravel will send a notification to Slack when a log message is logged with a log level higher than critical.

Conclusion

Using Laravel logging can easily record the log information of the application, help developers quickly discover and solve problems in the application, and improve the stability and reliability of the application. In the Laravel framework, we can easily use loggers, define different log levels and destinations, and flexibly configure logging in configuration files. Therefore, it is very important to learn Laravel logging.

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