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.

• Sanjib Chowdhury: Please refer to magento.stackexchange.com/questions/75935/…
• Nafsss: @SanjibChowdhury i am getting this error in exception.log file SQLSTATE[HY000] [2002] No such file or directory {"exception":"[object] (Zend_Db_Adapter_Exception(code: 2002): SQLSTATE[HY000] [2002] No such file or directory at /srv/public_html/vendor/magento/zendframework1/library/Zend/Db/Adapter/Pdo/Abstract.php:144, PDOException(code: 2002): SQLSTATE[HY000] [2002] No such file or directory at /srv/public_html/vendor/magento/zendframework1/library/Zend/Db/Adapter/Pdo/Abstract.php:128)"} []
• Sanjib Chowdhury: SQLSTATE[HY000] [2002] comes due to DB connection failed. please check if your database engine is working fine or not.
• Amrit Pal Singh: techurbane.com/how-to-add-custom-logs-in-magento-2

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");