Logging is an important part of any development process. Logs assist you to spot an error and the reason for it. Magento 2 contains built-in logging solution based on Monolog Library.<\/p>\n
To start working with a logger, you must create an instance of \\Psr\\Log\\LoggerInterface. With this interface, you can call the following functions to write data to log files:<\/p>\n
alert()
\ncritical()
\ndebug()
\nemergency()
\nerror()
\ninfo()
\nlog()
\nnotice()
\nwarning()<\/p>\n
All log methods contains 2 arguments, first one is the message text and the second one is an optional array.<\/p>\n
$this->_logger-> emergency($message);\r\n\/\/saved in var\/log\/system.log\r\n\r\n$this->_logger-> alert($message);\r\n\/\/saved in var\/log\/system.log\r\n \r\n$this->_logger-> critical($message);\r\n\/\/saved in var\/log\/system.log\r\n \r\n$this->_logger-> error($message);\r\n\/\/saved in var\/log\/system.log\r\n \r\n$this->_logger-> warning($message);\r\n\/\/saved in var\/log\/system.log\r\n \r\n$this->_logger-> notice($message);\r\n\/\/saved in var\/log\/system.log\r\n \r\n$this->_logger-> info($message);\r\n\/\/saved in var\/log\/system.log\r\n \r\n$this->_logger-> debug($message);\r\n\/\/saved in var\/log\/debug.log<\/pre>\nNote:<\/strong> The degug log is not generate when your Magento 2 website is in production mode.<\/p>\n
Below is an example of how to use logger in a custom method and how to log an exception.<\/p>\n
protected $_logger;\r\n \r\npublic function __construct(\r\n\t\\Magento\\Backend\\Block\\Template\\Context $context,\r\n\t\\Psr\\Log\\LoggerInterface $logger,\r\n\tarray $data = []\r\n)\r\n{ \r\n\t$this->_logger = $logger;\r\n\tparent::__construct($context, $data);\r\n}\r\n\r\npublic function customMethod()\r\n{\r\n\t$this->_logger->info('Info Message');\r\n\t\r\n\t\/\/ Log as an Exception\r\n\ttry {\r\n\t\t\/\/do something\r\n\t} catch (\\Exception $e) {\r\n\t\t$this->_logger->critical('Something went wrong', ['exception' => $e]);\r\n\t}\r\n}<\/pre>\nThats it. Enjoy Magento 2!!<\/p>\n","protected":false},"excerpt":{"rendered":"
Logging is an important part of any development process. Logs assist you to spot an error and the reason for it. Magento 2 contains built-in logging solution based on Monolog Library. To start working with a logger, you must create an instance of \\Psr\\Log\\LoggerInterface. With this interface, you can call the following functions to write… <\/p>\n