protected static function outputMessage($log_level, $msg, $backtrace)
{
if (self::$_level & $log_level) {
print strftime("%Y-%m-%d %H:%M:%S Phactory ") . self::$_level_strs[$log_level] . ' - ' . $msg . "\n";
if ($backtrace) {
debug_print_backtrace();
}
}
}