Mine

class error_handler {

	var $errors;
	var $debug = false;

	function error_handler() {
		if ((isset($_SERVER['QUERY_STRING']) && strpos($_SERVER['QUERY_STRING'], 'debug=') !== FALSE) || isset($_COOKIE['e107_debug_level'])) {
			$this->debug = true;
			error_reporting(E_ALL);
		} else {
			error_reporting(E_ERROR | E_PARSE);
		}
	}

	function handle_error($type, $message, $file, $line, $context) {
		switch($type) {
			case E_NOTICE:
			if ($this->debug == true) {
				$error['short'] = "Notice: {$message}, Line {$line} of {$file}<br />\n";
				$trace = debug_backtrace();
				$backtrace[0] = (isset($trace[1]) ? $trace[1] : "");
				$backtrace[1] = (isset($trace[2]) ? $trace[2] : "");
				$error['trace'] = $backtrace;
				$this->errors[] = $error;
			}
			break;
			case E_WARNING:
			if ($this->debug == true) {
				$error['short'] = "Warning: {$message}, Line {$line} of {$file}<br />\n";
				$trace = debug_backtrace();
				$backtrace[0] = (isset($trace[1]) ? $trace[1] : "");
				$backtrace[1] = (isset($trace[2]) ? $trace[2] : "");
				$error['trace'] = $backtrace;
				$this->errors[] = $error;
			}
			break;
			case E_USER_ERROR:
			if ($this->debug == true) {
				$error['short'] = "Internal Error Message: {$message}, Line {$line} of {$file}<br />\n";
				$trace = debug_backtrace();
				$backtrace[0] = (isset($trace[1]) ? $trace[1] : "");
				$backtrace[1] = (isset($trace[2]) ? $trace[2] : "");
				$error['trace'] = $backtrace;
				$this->errors[] = $error;
			}
			default:
			return true;
			break;
		}
	}