php Laravel $request->file() 返回 null
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Laravel $request->file() returns null
提问by Renārs Vilnis
having trouble trying to upload files using Laravel on the back-end.
尝试在后端使用 Laravel 上传文件时遇到问题。
Issue
问题
Laravel $request->file()method returns null.
Laravel$request->file()方法返回 null。
Setup
设置
I build up an AJAX request using superagent, debugged the request and everything seems fine. The Content-Lengthchanges depending on the image I add, indicating an image has been added to the request. The Content-Typeis also set to multipart/form-data.
我使用superagent构建了一个 AJAX 请求，调试了请求，一切看起来都很好。的Content-Length依赖于图像I附加的变化，指示图像已被添加到该请求。该Content-Type也被设置为multipart/form-data。
// request headers
Content-Length:978599
Content-Type:multipart/form-data;
// request payload
Content-Disposition: form-data; name="files"; filename="item-keymoment.png"
Content-Type: image/png
But I'm unable to get the file in Laravel. Using $request->file('files')returns NULL, but if I debug the $_FILESarray, I noticed that a my file has been uploaded.
但是我无法在 Laravel 中获取该文件。使用$request->file('files')return NULL，但如果我调试$_FILES数组，我注意到我的文件已上传。
dd($request->file('files'))
// NULL
dd($_FILES);
// array:1 [
// "files" => array:5 [
// "name" => "item-keymoment.png"
// "type" => "image/png"
// "tmp_name" => "/tmp/phpipbeeM"
// "error" => 0
// "size" => 978274
// ]
// ]
dd($request->files->all())
// []
What might be causing Laravel to ignore the file?Content-Typeof the input file not being application/octet-stream?
什么可能导致 Laravel 忽略该文件？Content-Type输入文件不是application/octet-stream？
Below have answered the question.
下面已经回答了问题。
采纳答案by Renārs Vilnis
Noticed that the $requestobject I was receiving in the Controller method was an Instance of JsonRequest, which is a custom class (empty for now) that extends Illuminate\Http\Request.
请注意，$request我在 Controller 方法中接收的对象是 Instance of JsonRequest，它是一个扩展的自定义类（目前为空）Illuminate\Http\Request。
And it's implemented as:
它的实现方式为：
<?php
namespace App\Http\Requests;
use Illuminate\Http\Request;
class JsonRequest extends Request {
}
But if I change:
但如果我改变：
// from
use App\Http\Requests\JsonRequest;
public function add_background_image (JsonRequest $request) {
dd($request->file('files'))
// NULL
}
// to
use Illuminate\Http\Request;
public function add_background_image (Request $request) {
dd($request->file('files'))
// UploadedFile {#266
// -test: false
// -originalName: "item-keymoment.png"
// -mimeType: "image/png"
// -size: 978274
// -error: 0
// ...
// }
}
I get the desired input file. For now switching the instance of $requestsolves my issue
我得到所需的输入文件。现在切换实例$request解决了我的问题
But I don't understand why/how extending
Illuminate\Http\Requestwith an empty Class breaks things.
Can someone explain?
但我不明白为什么/如何扩展
Illuminate\Http\Request空类会破坏事情。
有人可以解释一下吗？
My intention with subclassing Illuminate\Http\Requestwas to be able to attach methods on $requestsfor dealing with exceptions/errors in a unified way for API requests. Such as when in deployment show exception messages, but in production return a fixed message.
Is there different/better/more Laravel way of doing that?
I think will just create a JsonController instead of extending Request.
我对子类化的意图Illuminate\Http\Request是能够附加方法$requests，以统一的方式处理 API 请求的异常/错误。例如在部署时显示异常消息，但在生产中返回固定消息。
有没有不同/更好/更多的 Laravel 方法来做到这一点？
我认为只会创建一个 JsonController 而不是扩展请求。
回答by CarlosYanes
You should add to the form tag 'enctype="multipart/form-data'
您应该添加到表单标签 'enctype="multipart/form-data'
For example:
例如：
<form method="POST" action="{{route('back.post.new')}}" enctype="multipart/form-data">
......
</form>
Adding it you can use your custom Request.
添加它您可以使用您的自定义请求。
I hope this can you help!
我希望这能帮到你！
回答by Jeremy Quick
I had this problem ONLY on the server. The image is stored in the $_FILESvariable which points to a physical directory in your php.inifile. Make sure you have the correct permissions for this directory.
我只在服务器上有这个问题。图像存储在$_FILES指向php.ini文件中物理目录的变量中。确保您对此目录具有正确的权限。
php.ini:
php.ini:
upload_tmp_dir = /Applications/MAMP/tmp/php
upload_tmp_dir = /Applications/MAMP/tmp/php
