mage log magento 2

1<?php
2  $writer = new \Zend\Log\Writer\Stream(BP . '/var/log/MYLOGFILE.log');
3  $logger = new \Zend\Log\Logger();
4  $logger->addWriter($writer);
5  $logger->info('Your text message');
6?>

1<?php
2  $writer = new \Zend\Log\Writer\Stream(BP . '/var/log/logfile.log');
3  $logger = new \Zend\Log\Logger();
4  $logger->addWriter($writer);
5  $logger->info('Simple Text Log'); // Simple Text Log
6  $logger->info('Array Log'.print_r($myArrayVar, true)); // Array Log
7?>

1$writer = new \Zend\Log\Writer\Stream(BP . '/var/log/test.log');
2$logger = new \Zend\Log\Logger();
3$logger->addWriter($writer);
4$logger->info('Your text message');
5

1Mage::log('message',null,'logfile.log',true);
2Mage::log(print_r($arr, 1), null, 'logfile.log',true);

1\Magento\Framework\App\ObjectManager::getInstance()->get(\Psr\Log\LoggerInterface::class)->debug('Your message here');