函数参数前的三个点代表什么? [英] What do the three dots before a function argument represent?

问题描述

我正在使用Laravel 5.3，在其中一个功能中，我发现 代码:

I was working with Laravel 5.3 and in one of the functions, I found this piece of code:

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

    return $next($request);
}

代码来自\Illuminate\Auth\Middleware\Authenticate::class.

$guards变量之前的那三个点是什么?

What are those 3 dots before $guards variable?

推荐答案

它表示可能存在可变数量的参数.

It indicates that there may be a variable number of arguments.

当调用函数的参数超过3个时，$next之后的所有参数都将添加到$guards数组中.

When the function is called with more than 3 arguments, all the arguments after $next will be added to the $guards array.

您可以在此处上阅读有关内容.

You can read about it here.

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