A small MODX Snippet / Output Filter to log message to the MODX error log

log.php

<?php
/**
 * log : A small MODX Snippet / Output Filter to log message to the MODX error log
 *
 * @version : 1.0.0
 * @see     : https://gist.github.com/krismas/c321a4b3e29675424526
 * @name    : log.php
 * @author  : g.noel@ackwa.fr
 * @usage   : [[*aTV:log]]
 *            [[+aPH:log]]
 *            [[log?msg=`A message...`]]
 *
 * @history : 19/08/14 - 1.0.0 - Initial revision
 */
$msg = ($input ? $input : $modx->getOption('msg', $scriptProperties,'Empty message!'));
$modx->log(modX::LOG_LEVEL_ERROR, '[#'.$modx->resource->get('id').'] '.$msg);
return '';