How to create custom log file in magento 2

Question

Can anyone help me in creating custom logger file in mmagento 2. I want to display collection object in log file. So far, i have tried this code but did not work. getting $collection object from public function massAction(AbstractCollection $collection)

$writer = new \Zend\Log\Writer\Stream(BP . '/var/log/pdf.log');
    $logger = new \Zend\Log\Logger();
    $logger->addWriter($writer);
    $logger->info("Hello");
    $logger->info(print_r($collection->debug())); 

This is what i have tried yet.

Answer 1

Use the following code for Magento versions prior to 2.4.2.

$writer = new \Zend\Log\Writer\Stream(BP . '/var/log/custom.log');
$logger = new \Zend\Log\Logger();
$logger->addWriter($writer);
$logger->info('Custom message') 
$logger->info(print_r($object->getData(), true));

Use the following code for Magento 2.4.2

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

Use the following code for Magento 2.4.3

$writer = new \Zend_Log_Writer_Stream(BP . '/var/log/custom.log');
$logger = new \Zend_Log();
$logger->addWriter($writer);
$logger->info('text message');

Answer 2

Create Module/Namespace/etc/di.xml and add below config in the file.

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">


  <!-- Log generation process -->
<type name="Module\Namespace\Logger\Handler">
    <arguments>
        <argument name="filesystem" xsi:type="object">Magento\Framework\Filesystem\Driver\File</argument>
    </arguments>
</type>
<type name="Module\Namespace\Logger\Logger">
    <arguments>
        <argument name="name"      xsi:type="string">Module/Namespace</argument>
        <argument name="handlers"  xsi:type="array">
            <item name="debug"     xsi:type="object">Module\Namespace\Logger\Handler</item>
        </argument>
    </arguments>   
</type>

Create Module/Namespace/Logger/Handler.php

    namespace Module\Namespace\Logger;

    use Magento\Framework\Filesystem\DriverInterface;
    use Magento\Framework\Logger\Handler\Base;
    use Magento\Framework\Stdlib\DateTime\TimezoneInterface;  
    class Handler extends Base {

        public function __construct(
            DriverInterface $filesystem
        ) {

            $this->fileName = "/var/log/pdf.log";
            parent::__construct($filesystem);
        }

    }

Create Module/Namespace/Logger/Logger.php

class Logger extends \Monolog\Logger
{

}

Now use Module\Namespace\Logger\Logger instead of Psr\Log\LoggerInterface;

namespace Module\Namespace\Model;

use Module\Namespace\Logger\Logger;


class Association
{


     /**
     * @var Logger
     */
    protected $logger;

    /**
     * __construct
     * 
     * @param Logger $logger
     */
    public function __construct(

        Logger $logger
    )
    {


        $this->logger = $logger;
    }


    /**
     * Generating log
     * 
     * @param string $email
     * @param string $name
     */
    public function generateLog($email, $name)
    {
        $logMessage = array(
            'Email' => $email,
            'Name' => $name
        );

        $this->logger->log(100, json_encode($logMessage));
    }

Answer 3

You can use any of the following methods. sure one of them will work.

**Method 1:**
$writer = new \Zend_Log_Writer_Stream(BP . '/var/log/customfile.log');
$logger = new \Zend_Log();
$logger->addWriter($writer);
$logger->info('I am logged from Zend_log_writer');


Method 2:
$writer = new \Zend\Log\Writer\Stream(BP . '/var/log/logfileZend.log');
$logger = new \Zend\Log\Logger();
$logger->addWriter($writer);
$logger->info('Simple Text Log from Zend logger 2'); // Simple Text Log


Method 3:
$writer = new \Laminas\Log\Writer\Stream(BP . '/var/log/customlaminas.log');
$logger = new \Laminas\Log\Logger();
$logger->addWriter($writer);
$logger->info("log from laminas log");