Logging for PHP with STDERR (Heroku compliant)

stderr_logger.php

<?php

defined('STDERR') OR define('STDERR', fopen('php://stderr', 'w'));

logger::implement('write', function ($type, $message) {
  $remote  = server('REMOTE_ADDR');
  $message = preg_replace('/[\r\n]+\s*/', ' ', $message);

  fputs(STDERR, "$remote [$type] $message\n");
});