Laravel - 如何在匿名函数里面传递请求数据

问题描述：

So I want to get all items if the user hasn't selected any options, otherwise query the items according to the request data. However I can't pass the $request to my function. Here is my code:

public function showProducts(Request $request) 
{
       $products = Product::all();
       if(count($request->all()) != 0) {
                $products = Product::where(function($query) {
                    $minPrice = $request['min'] ? $request['min'] : null;
                    $maxPrice = $request['max'] ? $request['max'] : null;
                    $colors = $request['color'] ? $request['color'] : null;
                    $sizes = $request['size'] ? $request['size'] : null;

                    if($minPrice != null && $maxPrice != null) {
                        $query->where('price', '>=', $minPrice)->where('price', '<=', $maxPrice);
                    }

                    if($minPrice == null && $maxPrice == null && $colors == null && $sizes == null)  {

                    }
                })->get();
            }
}

Obviously I have $request in my showProducts closure however I can't access it inside my anonymous function inside where. How can I use my $request data in the anonymous function?

因此，如果用户未选择任何选项，我想获取所有项目，否则根据请求数据。但是我无法将$ request code>传递给我的函数。这是我的代码： p>

  public function showProducts（Request $ request）
 {
 $ products = Product :: all（）; 
 if（count（$ request）  - ＆gt; all（））！= 0）{
 $ products = Product :: where（function（$ query）{
 $ minPrice = $ request ['min']？$ request ['min']：null  ; 
 $ maxPrice = $ request ['max']？$ request ['max']：null; 
 $ colors = $ request ['color']？$ request ['color']：null; 
 $  sizes = $ request ['size']？$ request ['size']：null; 
 
 if if（$ minPrice！= null＆amp;＆amp; $ maxPrice！= null）{
 $ query-＆gt; where  （'price'，'＆gt; ='，$ minPrice） - ＆gt; where（'price'，'＆lt; ='，$ maxPrice）; 
} 
 
 if（$ minPrice == null＆amp;＆amp;  ; $ maxPrice == null＆amp;＆amp; $ colors == null＆amp;＆amp; $ sizes == null）{
 
} 
}） - ＆gt; get（）; 
} 
} 
   code>  pre> 
 
 显然我的请求中有$  owProducts关闭但是我无法在 where  code>里面的匿名函数中访问它。 如何在匿名函数中使用我的$ request数据？ p> 
  div>

答

You need to use the use keyword to pass in parameters from the parent scope:

$products = Product::where(function($query) use ($request) {
    // $request is now available

Now $request is available in your closure.

See here: http://php.net/manual/en/functions.anonymous.php#example-200

Laravel - 如何在匿名函数里面传递请求数据

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