Monolog stdout and file log

log.php

<?php 

use Monolog\Logger;
use Monolog\Handler\StreamHandler;

require './vendor/autoload.php';

// create a log channel
$log = new Logger('name');
$log->pushHandler(new StreamHandler('your.log', Logger::WARNING));
$log->pushHandler(new \Monolog\Handler\ErrorLogHandler());

// add records to the log
$log->warning('Foo');
$log->error('Bar');