How to implement logging in Yii?

@brandy 

Yii provides built-in support for logging to help you track errors, debugging information, and other messages. The logging mechanism in Yii is based on the PSR-3 logging interface, which means that it can be easily extended to support different logging backends, such as file, database, or email.

To implement logging in Yii, follow these steps:

1. Configure the logging component in the application configuration file (config/web.php or config/console.php). You can define different logging targets, such as file, database, or email, and specify the levels of messages to log for each target. For example, to log messages to a file, you can add the following code to the configuration file:

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'components' => [
    'log' => [
        'targets' => [
            [
                'class' => 'yiilogFileTarget',
                'levels' => ['error', 'warning'],
            ],
        ],
    ],
],

This configuration defines a FileTarget logging target that logs messages with levels error and warning to a file.

1. Use the logging component in your code by calling the Yii::info(), Yii::warning(), Yii::error(), or other logging methods. For example:

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Yii::info('This is an informational message.');
Yii::warning('This is a warning message.');
Yii::error('This is an error message.');

These methods will log the specified message to the logging targets that are configured in the application.

1. View the logged messages in the target location. For example, if you configured a FileTarget, you can view the logged messages in the specified log file.

That's it! With these simple steps, you can start logging messages in your Yii application. You can customize the logging configuration to suit your needs, and you can also create your own logging targets by extending the yiilogTarget class.