logs in magento 2 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: log magento 1

Mage::log('message',null,'logfile.log',true);