Laravel 8 throw_if() {#collection-method}

在给定的布尔表达式结果为 true 时，throw_if 函数抛出给定的异常：

throw_if(! Auth::user()->isAdmin(), AuthorizationException::class);

throw_if(
    ! Auth::user()->isAdmin(),
    AuthorizationException::class,
    'You are not allowed to access this page'
);