Php 未定义变量：子方法中的请求

当我试图获取与category表相关的所有记录时，其中category\u definition\u id是搜索输入，我无法访问sub方法中的$request->category变量。这是在拉雷维尔5.5。有什么想法吗

public function jobopenings(Request $request)
{
  $category_definitions = Category_definition::all();
  $skill_definitions = Skill_definition::all();

  $ads = new Ad;

  // Search for a user based on their name.
  if ($request->has('category')) {

    $ads = $ads->whereHas('categories', function($query){
        $query->where('category_definition_id', $request->category);
      });
  }

  $ads = $ads->where('type','1')->orderBy('created_at','desc')->paginate(15);

    return View::make('jobs')
    ->with('ads', $ads)
    ->with('category_definitions',$category_definitions)
    ->with('skill_definitions', $skill_definitions)
    ->with('ad_type','1');
}

---

您必须使用

use（$request）

声明它：

---

添加

use

子句：

$ads = $ads->whereHas('categories', function($query) use ($request) {
        $query->where('category_definition_id', $request->category);
    });
}

$ads = $ads->whereHas('categories', function($query) use ($request) {
        $query->where('category_definition_id', $request->category);
    });
}