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monolog-logging PHP library

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monolog-logging PHP library

Monolog is a relatively complete and easily expandable logging library under PHP. Currently, many well-known PHP frameworks including Symfony, Laravel, CakePHP, etc. have built-in Monolog. Monolog can send your logs to files, sockets, inboxes, databases and various web services.

Monolog follows the PSR3 interface specification and can be easily replaced with other logging libraries that follow the same specification. Monolog has good scalability. Through the interfaces Handler, Formatter and Processor, the Monolog class library can be extended and customized in various ways.

Basic usage

<?php 
use Monolog\Logger; 
use Monolog\Handler\StreamHandler; 
 
// 创建日志频道 
$log = new Logger('name'); 
$log->pushHandler(new StreamHandler('path/to/your.log', Logger::WARNING)); 
 
// 添加日志记录 
$log->addWarning('Foo'); 
$log->addError('Bar');

Core concept

Each Logger instance contains a channel name (channel) and a handler stack. When you add a record, the record is processed through the handler stack. Each handler can also decide whether to pass the record to the next handler in the next stack.

Through handlers, we can implement some complex log operations. For example, if we put the StreamHandler at the bottom of the stack, all log records will eventually be written to the hard disk file. At the same time, we put the MailHandler at the top of the stack and send the error log via email by setting the log level. There is a $bubble attribute in Handler. This attribute defines whether the handler intercepts records and prevents them from flowing to the next handler. So if we set the $bubble parameter of MailHandler to false, when an error log occurs, the log will be sent through MailHandler instead of being written to the hard disk through StreamHandler.

Multiple Loggers can be created, and each can define its own channel name and handler stack. Handlers can be shared among multiple Loggers. The channel name will be reflected in the log, making it easier for us to view and filter log records.

If the log format (Formatter) is not specified, Handler will use the default Formatter.

The log levels cannot be customized. Currently, the eight levels defined in RFC 5424 are used: debug, info, notice, warning, error, critical, alert, and emergency. If you have other needs for log records, you can add content to the log records through Processo.

Log level

DEBUG (100): Detailed debug information.

INFO (200): Key event.

NOTICE (250): An ordinary but important event.

WARNING (300): A non-error exception occurred.

ERROR (400): Runtime error, but does not need to be handled immediately.

CRITICA (500): Serious error.

EMERGENCY (600): The system is unavailable.

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