Mage log magento 2

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

Log magento 1

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

Source: magento.stackexchange.com

Magento2 zend log

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

Logger magento2

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

Source: magento.stackexchange.com

Mage log equivalent magento 2

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

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