laravel之null替换空字符串中间件

$goods->name?$goods->name:‘‘;

class ReplaceNullMiddleware
{
    public function handle($request, Closure $next)
    {
        $response = $next($request);
        $data = json_decode($response->getContent(), true);
        if(isset($data[‘data‘])){
            $newData = _unsetNull($data[‘data‘]);
            $data[‘data‘] = $newData;
            return $response->setContent(json_encode($data));
        }
        return $response;
    }
}

Route::post(‘/employeeList‘, ‘ComController@employeeList‘)->middleware(‘replaceNull‘);

//递归方式把数组或字符串 null转换为空‘‘字符串
function _unsetNull($arr){
    if($arr !== null){
        if(is_array($arr)){
            if(!empty($arr)){
                foreach($arr as $key => $value){
                    if($value === null){
                        $arr[$key] = ‘‘;
                    }else{
                        $arr[$key] = _unsetNull($value);      //递归再去执行
                    }
                }
            }
        }else{
            if($arr === null){ $arr = ‘‘; }         //注意三个等号
        }
    }else{ $arr = ‘‘; }
    return $arr;
}