Php 如何检查图像是否存在laravel

我正在发布来自iOS的带有一些参数的数据。我已将图像转换为字节并将其上载到服务器。参数的数据正在成功保存。但我无法检查是否出现任何图像。是否有任何方法或东西来检查请求中是否存在任何图像？下面是为存储数据而编写的代码。我敢肯定，除了图像，其他一切都很好。iOS应用程序已成功发送字节。我无法处理或从请求中提取图像

public function createIdea(Request $request) {
    $filename = '';
    if ($request->hasFile('idea_image')) {
        $filename = $request->file('idea_image')->getClientOriginalName();
        $moveImage = $request->file('idea_image')->move('images', $filename);
    }
    $idea = new Idea();
    $idea->idea_info = $request->input('idea_title');
    $idea->idea_info = $request->input('idea_info');
    $idea->idea_image = "images/".$filename;
    $idea->idea_location = $request->input('idea_location');
    $idea->idea_description = $request->input('idea_description');
    $idea->idea_description = $request->input('selection');
    $idea->user_id = \Auth::id();
    dd($idea);
    $idea->save();
    $ideaId = $idea->id;
    if ( ! $idea->id ) {
        $statusCode =404;
        response()->json(array('Status:' => 'Idea Creation FAILED'),$statusCode);
    }else{
        $response = $idea->toJson();
        $statusCode =200;
        return response()->json(array('Status:' => 'Idea Created Successfully', 'ideaId' => $ideaId),$statusCode);
    }
}

简单

if (File::exists($myfile)) {
    echo "Yup. It exists.";
}