I just switched to monolog and wanted to log my message to the PHP console instead of a file. This might seem obvious for some people, but it took me a little while to figure out how to do that and I couldn't find a similar question/answer on SO.
The example on Monolog's Github readme only shows how to use a file:
<?php
use Monolog\Logger;
use Monolog\Handler\StreamHandler;
// create a log channel
$log = new Logger('name');
$log->pushHandler(new StreamHandler('path/to/your.log', Logger::WARNING)); // <<< uses a file
// add records to the log
$log->addWarning('Foo');
$log->addError('Bar');
But it doesn't state anywhere how messages can be logged to the console. After searching on Google, I landed either on a help page for Symfony or questions of people looking for a way to log to the browser console.
Using json_encode function$js_code = 'console. log(' . json_encode($output, JSON_HEX_TAG) . You can call this function at the exact place you want to run the console_log that we just created above.
Monolog is the existing standard logging library for PHP. It is most popular in PHP frameworks such as Laravel and Symfony, where it implements a common interface for logging libraries.
Monolog log levelsDEBUG - detailed debug information. INFO - interesting events. NOTICE - normal but significant events. WARNING - exceptional occurrences that are not errors.
The solution is rather simple. Since the example shows a StreamHandler
it's possible to pass in a stream (instead of the path to a file). By default, everything that is echo'ed in PHP is written to php://stdout / php://output so we can simple use one of those as stream for the StreamHandler
:
<?php
use Monolog\Logger;
use Monolog\Handler\StreamHandler;
// create a log channel
$log = new Logger('name');
$log->pushHandler(new StreamHandler('php://stdout', Logger::WARNING)); // <<< uses a stream
// add records to the log
$log->warning('Foo');
$log->error('Bar');
Hope this saves somebody some time :)
Some extra details if you want to tweak the default message formatting at the same time:
use Monolog\Logger;
use Monolog\Formatter\LineFormatter;
use Monolog\Handler\StreamHandler;
$output = "[%datetime%] %channel%.%level_name%: %message%\n";
$formatter = new LineFormatter($output);
$streamHandler = new StreamHandler('php://stdout', Logger::DEBUG);
$streamHandler->setFormatter($formatter);
$logger = new Logger('LoggerName');
$logger->pushHandler($streamHandler);
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