magento 1 log in lib code example

Example 1: 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
?>

Example 2: mage log equivalent magento 2

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

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Misc Example

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