Replaces PHP's default error handler with one that sends everything to a GELF server (tested with Graylog2)

gelfErrorHandler.php

<?php
/**
 * Replaces PHP's default error handler with one that 
 * sends everything to a GELF server (tested with Graylog2)
 *
 * From the PHP docs: The following error types cannot be handled with 
 * a user defined function: E_ERROR, E_PARSE, E_CORE_ERROR, E_CORE_WARNING, 
 * E_COMPILE_ERROR, E_COMPILE_WARNING, and most of E_STRICT raised in the 
 * file where set_error_handler() is called. 
 * 
 * ALSO - This requires the GELF PHP library: https://github.com/Graylog2/gelf-php
 *
 * To use in your app, ensure the GELF lib files are findable by your autoloader or
 * load them manually, then include() this file. Also edit the two consts below as 
 * needed.
 *
 * TODO: add set_exception_handler now that I know this thing works so far
 * 
 * @author Yehuda Rosen <yrosen@tikvahfund.org>
 * @version 1 - 27 Dec 2012
 */

set_error_handler(array('GELFErrorHandler', 'errorHandler'));

class GELFErrorHandler {
  // Set these as needed:
	const GELF_HOST = '10.10.65.55';
	const FACILITY  = 'Development site';

	static function errorHandler($errno, $errstr, $errfile, $errline, $errcontext) {

		$message = new GELFMessage();
		
		// Figure out error level:
		switch($errno) {
			case E_USER_ERROR:
			case E_RECOVERABLE_ERROR:
				$errorlevel = GELFMessage::CRITICAL;
				break;

			case E_WARNING:
			case E_USER_WARNING:
			case E_DEPRECATED:
				$errorlevel = GELFMessage::WARNING;
				break;

			case E_NOTICE:
			case E_USER_NOTICE:
			case E_STRICT:
			default:
				$errorlevel = GELFMessage::NOTICE;
				break;
		}

		// Build GELF message:
		$message->setShortMessage($errstr)
			   ->setFullMessage(json_encode(debug_backtrace()))
			   //->setFullMessage($errstr)
			   ->setHost(gethostname())
			   ->setLevel($errorlevel)
			   ->setFile($errfile)
			   ->setFacility(self::FACILITY)
			   ->setLine($errline);

		// Send GELF message:
		$publisher = new GELFMessagePublisher(self::GELF_HOST);
		$publisher->publish($message);
		
		return true;
	}
}