Phan\Debug::backtrace PHP Method

    public static function backtrace(int $levels = 0)
    {
        $bt = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, $levels + 1);
        foreach ($bt as $level => $context) {
            if (!$level) {
                continue;
            }
            echo "#" . ($level - 1) . " {$context['file']}:{$context['line']} {$context['class']} ";
            if (!empty($context['type'])) {
                echo $context['class'] . $context['type'];
            }
            echo $context['function'];
            echo "\n";
        }
    }