2.8 KiB
Logging
Yii provides flexible and extensible logger that is able to handle messages according to serverity level or their type. You may filter messages by multiple criteria and forward them to files, email, debugger etc.
Logging basics
Basic logging is as simple as calling one method:
\Yii::info('Hello, I am a test log message');
Message category
Additionally to the message itself message category could be specified in order to allow filtering such messages and
handing these differently. Message category is passed as a second argument of logging methods and is application
by
default.
Severity levels
There are multiple severity levels and corresponding methods available:
- Yii::trace used maily for development purpose to indicate workflow of some code. Note that it only works in
development mode when
YII_DEBUG
is set totrue
. - Yii::error used when there's unrecoverable error.
- Yii::warning used when an error occured but execution can be continued.
- Yii::info used to keep record of important events such as administrator logins.
Log targets
When one of the logging methods is called, message is passed to yii\log\Logger component also accessible as
Yii::$app->log
. Logger accumulates messages in memory and then when there are enough messages or when current
request finishes, sends them to different log targets, such as file or email.
You may configure the targets in application configuration, like the following:
[
'components' => [
'log' => [
'targets' => [
'file' => [
'class' => 'yii\log\FileTarget',
'levels' => ['trace', 'info'],
'categories' => ['yii\*'],
],
'email' => [
'class' => 'yii\log\EmailTarget',
'levels' => ['error', 'warning'],
'message' => [
'to' => ['admin@example.com', 'developer@example.com'],
'subject' => 'New example.com log message',
],
],
],
],
],
]
In the config above we are defining two log targets: yii\log\FileTarget and yii\log\EmailTarget.
In both cases we are filtering messages handles by these targets by severity. In case of file target we're
additionally filter by category. yii\*
means all categories starting with yii\
.
Each log target can have a name and can be referenced via the yii\log\Logger::targets property as follows:
Yii::$app->log->targets['file']->enabled = false;
When the application ends or yii\log\Logger::flushInterval is reached, Logger will call yii\log\Logger::flush() to send logged messages to different log targets, such as file, email, web.
Configuring context information
TDB
Profiling
TBD
- Yii::beginProfile()
- Yii::endProfile()