laravel excel 导出乱码

在使用laravel excel 导出excel数据时，xls格式会出现乱码

一种解决办法是 导出格式变成csv

另外一种就是使用 ob_end_clean

附上自己使用laravel-admin封装的通用导出方法：针对页面的显示导出对应数据

public function export()
{
    $file_name = date("Y-m-d") .'-'. $this->grid->model()->eloquent()->getTable();
    Excel::create($file_name, function($excel) use ($file_name) {
        $model_name = get_class($this->grid->model()->eloquent());
        $excel->sheet($file_name, function($sheet) use ($model_name) {
            $name = [];
            $label = [];
            foreach ($this->grid->columns() as $k => $v) {
                $name[] = $v->getName();
                $label[] = $v->getLabel();
            }
            $data =$this->getData();
            $rows = [];
            foreach ($data as $k => $v) {
                $rows[] = array_dot($this->sanitize($v));
            }
            $rows = collect($rows)->map(function($item) use ($name) {
                return array_only($item, $name);
            });
            $rows = $this->sort_arr($rows, $name, $model_name);
            //dump($name);
            //dd($rows);
            $sheet->row(1, $label);
            $sheet->rows($rows);
            ob_end_clean();
        });
    })->export('xls');//csv
}

/**
 * Remove indexed array.
 *
 * @param array $row
 *
 * @return array
 */
protected function sanitize(array $row)
{
    return collect($row)->reject(function ($val) {
        return is_array($val) && !Arr::isAssoc($val);
    })->toArray();
}

/**
 * @param $arr
 * @param $keys
 * @param $model_name
 * @return array
 */
public function sort_arr($arr, $keys, $model_name)
{
    $new_arr = [];
    foreach ($arr as $k => $v) {
        foreach ($v as $kk => $vv) {
            if (stripos($kk, '.')) {
                list($l1, $l2) = explode('.', $kk);
                if(method_exists($l1,'_gird_'.$l2)) {
                    $v[$kk] = call_user_func_array([ucwords($l1), '_gird_'.$l2], [$vv]);
                }
            } else {
                if(method_exists($model_name,'_gird_'.$kk)) {
                    $v[$kk] = call_user_func_array([$model_name, '_gird_'.$kk], [$vv]);
                }
            }
        }
        foreach ($keys as $kk => $vv) {
            $new_arr[$k][$vv] = $v[$vv];
        }
    }
    //dd($new_arr);
    return $new_arr;
}