use Monolog\Logger;
use Monolog\Handler\SyslogHandler;
use Monolog\Handler\StreamHandler;
use Monolog\Handler\FirePHPHandler;
use Monolog\Handler\RotatingFileHandler;

$log = new Logger('MONOLOG_TEST');
$handler = new StreamHandler('./app.log',Logger::DEBUG);
$log->pushHandler($handler);
  
  
$log->addDebug('debug log');
$log->addInfo('info log');
$log->addWarning('warning log');
$log->addError('error log');