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It used to be hard to find questions about operators and other syntax tokens.¹
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我正在查看 Laravel 代码并在 Authenticate.php 中间件中找到了这个：

  public function handle($request, Closure $next, ...$guards)
    {
        $this->authenticate($guards);

        return $next($request);
    }

没见过这种东西，3点有什么作用？我用谷歌搜索但什么也没找到