Convert Mage::log Statement to Magento 2

Question

I want to convert this code from Magento 1 to Magento 2 , it is normally converted like this but I think there is an error

1. Code In Magento 2 but still Mage::log exist

       foreach ($results['data'] as $data) {
           if ($data->countryCode != $params['countryCode']) {
               Mage::log($data->countryCode . ' - ' . $params['countryCode'], Zend_Log::DEBUG, 'cap.log');
               Mage::log($results, Zend_Log::DEBUG, 'cap.log');
               unset($results['data']);
           }
   

2. The code checked

   foreach ($results['data'] as $data) {
               if ($data->countryCode != $params['countryCode']) {
                   $this->logger->debug($data->countryCode . ' - ' . $params['countryCode']);
                   $this->logger->debug($results);
                   unset($results['data']);
               }
   

Additional code for better comprehension of the problem

use Psr\Log\LoggerInterface; 
class xxxx extends yyyyy
{
    /**
     * @var  $logger
     * */
    protected $logger;

    /**
     * @var Data
     */
    protected $helper;

    /**
     * xxxx constructor.
     * @param Data $helper
     * @param LoggerInterface $logger
     */
    public function __construct(
        Data $helper,
        LoggerInterface $logger
    ) {
        $this->helper = $helper;
        $this->logger=$logger;
        parent::__construct();
    }

Thanks in advance,

Answer 1

Did you inject a LoggerInterface in your class and defined $this->logger ?

Otherwise can you provide more information, for example the error you get or the full code of your class ?

Answer 2

check below code

<?php

use Psr\Log\LoggerInterface;

class Save extends Action
{
    private $logger;

    public function __construct(
        Context $context,
        LoggerInterface $logger
    )
    {
        $this->logger = $logger;
        parent::__construct($context);
    }

}

write below code to write a proper array format in your log file.

$this->_logger->log(100,print_r($results,true));

or

$this->logger->info(print_r($results, true));

write below code to write a proper string in your log file.

$this->logger->info('countryCode'.$params['countryCode']);

try to implement the below code in your code.

foreach ($results['data'] as $data) {
        if ($data->countryCode != $params['countryCode']) {
            $this->logger->info($data->countryCode.$params['countryCode']);
            $this->logger->log(100,print_r($results,true));
            unset($results['data']);
        }

I hope this will help you.